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Secondary 4 Principles of Accounts Inventory Costing Quiz

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Secondary 4 Principles of Accounts Quiz - Inventory Costing

Name: _________________________ Class: Secondary 4 ____ Date: _________________________ Score: _____ / 50

Duration: 45 minutes Total Marks: 50

Instructions:

Answer ALL questions in the spaces provided.
Show all workings clearly. Marks are awarded for method.
Use a calculator where necessary.
Round all ratios to 2 decimal places unless otherwise stated.
Where explanations are required, write in complete sentences.

Section A: Short Answer (10 marks)

Answer all questions in this section.

1. State the basis on which inventory should be valued in the financial statements.
[1 mark]

2. State the accounting concept that underlies the inventory valuation basis.
[1 mark]

3. Explain the difference between a cash purchase and a credit purchase of inventory.
[2 marks]

4. State two reasons why a business might experience a decline in its inventory turnover rate compared to the previous year.
[2 marks]

5. A business discovered that its closing inventory was overstated by $2,500. State the effect of this error on the gross profit for the year.
[1 mark]

Section B: Calculations (20 marks)

Show all workings clearly. Marks are awarded for method.

6. The following information relates to Tan Trading for the year ended 31 December 2025:

Item	$
Opening inventory	12,400
Purchases	85,600
Purchase returns	3,200
Carriage inwards	1,800
Closing inventory	14,200

Calculate the cost of sales for the year ended 31 December 2025.
[3 marks]

7. Lim Enterprises provided the following data for the year ended 30 June 2025:

Item	$
Revenue	240,000
Opening inventory	18,500
Purchases	156,000
Closing inventory	22,100

Calculate: (a) The cost of sales for the year. [2 marks]

(b) The gross profit for the year. [1 mark]

8. The following information was extracted from the books of Wong Retailers for two consecutive years:

	Year ended 31 Dec 2024	Year ended 31 Dec 2025
Cost of sales ($)	180,000	210,000
Opening inventory ($)	25,000	30,000
Closing inventory ($)	30,000	36,000

Calculate the inventory turnover rate (in times per year) for: (a) Year ended 31 December 2024 [2 marks]

(b) Year ended 31 December 2025 [2 marks]

9. Chen Department Store sells three product lines. The following information is available at 31 March 2025:

Product	Cost ($ per unit)	Estimated selling price ($ per unit)	Estimated selling costs ($ per unit)	Units on hand
Alpha	45	52	3	200
Beta	68	70	5	150
Gamma	92	88	4	100

Calculate the total value of closing inventory at 31 March 2025 using the lower of cost and net realisable value principle.
[4 marks]

10. Ahmad Trading reported a gross profit of $78,000 for the year ended 31 August 2025. Revenue for the year was$ 260,000. Opening inventory was $32,000 and closing inventory was$ 28,000.

Calculate: (a) The cost of sales for the year. [1 mark]

(b) The total purchases for the year (assume no purchase returns or carriage inwards). [2 marks]

Section C: Structured Response (10 marks)

Answer all questions in this section. Show all workings where calculations are required.

11. Jasmine Fashion Boutique uses the First-In-First-Out (FIFO) method to value its inventory. The following transactions occurred for a particular dress design during January 2025:

Date	Transaction	Units	Cost per unit ($)
Jan 1	Opening inventory	20	40
Jan 8	Purchases	30	44
Jan 15	Sales	25	—
Jan 22	Purchases	25	48
Jan 28	Sales	35	—

(a) Calculate the cost of closing inventory as at 31 January 2025 using the FIFO method. [4 marks]

(b) Calculate the cost of sales for January 2025 using the FIFO method. [2 marks]

12. Two businesses, PQR Ltd and STU Ltd, operate in the same industry. The following ratios were calculated for the year ended 31 December 2025:

Ratio	PQR Ltd	STU Ltd
Gross profit margin	35%	28%
Inventory turnover rate	8 times	12 times

(a) Compare and comment on the inventory management of the two businesses. [3 marks]

(b) Explain one possible reason why PQR Ltd has a higher gross profit margin but a lower inventory turnover rate compared to STU Ltd. [2 marks]

Section D: Extended Response (10 marks)

Answer all questions in this section.

13. Define the term "net realisable value" (NRV) as it applies to inventory valuation.
[1 mark]

14. State two possible causes of inventory shrinkage in a retail business.
[2 marks]

15. The owner of MegaMart is reviewing the business's inventory performance. The following information is available:

	2024	2025
Inventory turnover rate	10 times	6 times
Gross profit margin	25%	30%

(a) Explain two possible reasons for the decrease in the inventory turnover rate from 2024 to 2025. [4 marks]

(b) Despite the lower inventory turnover rate, the gross profit margin improved. Explain how this could occur. [2 marks]

16. On 28 February 2025, the accountant of Rainbow Gifts discovered that the closing inventory as at 31 December 2024 had been understated by $4,800.

(a) State the effect of this error on the gross profit for the year ended 31 December 2024. [1 mark]

(b) State the effect of this error on the gross profit for the year ended 31 December 2025, assuming no other errors. [1 mark]

17. Explain the importance of using a consistent inventory costing method (such as FIFO) from one accounting period to the next.
[2 marks]

18. State one advantage and one disadvantage of using the First-In-First-Out (FIFO) method for inventory valuation.
[2 marks]

19. A business values its inventory at cost, $50,000. The net realisable value of the inventory is$ 46,000. Explain the accounting treatment required and state the amount at which inventory should be reported in the financial statements.
[2 marks]

20. Distinguish between the periodic inventory system and the perpetual inventory system.
[2 marks]

END OF QUIZ

Check your work carefully before submitting.

Answers

Secondary 4 Principles of Accounts Quiz - Inventory Costing

ANSWER KEY AND MARKING SCHEME

Total Marks: 50

Section A: Short Answer (10 marks)

1. State the basis on which inventory should be valued in the financial statements.
[1 mark]

Answer: Inventory should be valued at the lower of cost and net realisable value (NRV).

Award 1 mark for correct answer. Accept "lower of cost and net realisable value" or "lower of cost and market value."

2. State the accounting concept that underlies the inventory valuation basis.
[1 mark]

Answer: The prudence (conservatism) concept.

Award 1 mark for "prudence concept" or "conservatism concept." The concept requires that assets should not be overstated and losses should be recognised as soon as they are foreseen.

3. Explain the difference between a cash purchase and a credit purchase of inventory.
[2 marks]

Answer:

Cash purchase: Payment is made at the time of purchase. The business pays immediately and receives the goods. Journal entry: Dr. Purchases / Cr. Cash.
Credit purchase: Payment is made at a later date. The business receives goods now but pays later. Journal entry: Dr. Purchases / Cr. Trade Payables.

Award 1 mark for each correct explanation. Must mention timing of payment and the accounting treatment or effect on payables/cash.

4. State two reasons why a business might experience a decline in its inventory turnover rate compared to the previous year.
[2 marks]

Answer (any two of the following or similar valid reasons):

Overstocking / purchasing too much inventory relative to sales demand.
Decreased sales volume while inventory levels remained the same or increased.
Slow-moving or obsolete inventory that is not selling.
Change in product mix toward slower-moving items.
Inefficient inventory management or poor demand forecasting.
Seasonal factors or economic downturn affecting demand.

Award 1 mark for each valid reason (maximum 2 marks). Reasons must be plausible and clearly stated.

5. A business discovered that its closing inventory was overstated by $2,500. State the effect of this error on the gross profit for the year.
[1 mark]

Answer: Gross profit is overstated by $2,500.

Explanation: Closing inventory overstated → Cost of sales understated → Gross profit overstated. Award 1 mark for correct direction and amount.

Section B: Calculations (20 marks)

6. Calculate the cost of sales for Tan Trading for the year ended 31 December 2025.
[3 marks]

Answer:

	$
Opening inventory	12,400
Add: Purchases	85,600
Less: Purchase returns	(3,200)
Add: Carriage inwards	1,800
Net purchases	84,200
Cost of goods available for sale	96,600
Less: Closing inventory	(14,200)
Cost of sales	82,400

Marking scheme:

1 mark for correct calculation of net purchases ( $85,600 −$ 3,200 + $1,800 =$ 84,200)
1 mark for correct cost of goods available for sale ( $12,400 +$ 84,200 = $96,600)
1 mark for correct cost of sales ( $96,600 −$ 14,200 = $82,400)

Accept alternative layouts if logically correct. Award method marks even if final answer is incorrect due to arithmetic error.

7. Lim Enterprises calculations:
[5 marks total]

(a) Cost of sales for the year. [2 marks]

	$
Opening inventory	18,500
Add: Purchases	156,000
Cost of goods available for sale	174,500
Less: Closing inventory	(22,100)
Cost of sales	152,400

Award 1 mark for correct formula/structure, 1 mark for correct answer.

(b) Gross profit for the year. [1 mark]

Gross profit = Revenue − Cost of sales
= $240,000 −$ 152,400 = $87,600

Award 1 mark for correct answer.

(c) Gross profit margin (to 2 decimal places). [2 marks]

Gross profit margin = (Gross profit ÷ Revenue) × 100%
= ( $87,600 ÷$ 240,000) × 100%
= 36.50%

Award 1 mark for correct formula, 1 mark for correct answer with 2 decimal places.

8. Wong Retailers inventory turnover rate:
[4 marks total]

(a) Year ended 31 December 2024 [2 marks]

Average inventory = (Opening + Closing) ÷ 2
= ( $25,000 +$ 30,000) ÷ 2 = $27,500

Inventory turnover = Cost of sales ÷ Average inventory
= $180,000 ÷$ 27,500
= 6.55 times (to 2 decimal places)

Award 1 mark for correct average inventory, 1 mark for correct turnover rate.

(b) Year ended 31 December 2025 [2 marks]

Average inventory = ( $30,000 +$ 36,000) ÷ 2 = $33,000

Inventory turnover = $210,000 ÷$ 33,000
= 6.36 times (to 2 decimal places)

Award 1 mark for correct average inventory, 1 mark for correct turnover rate.

9. Chen Department Store closing inventory valuation:
[4 marks]

Step 1: Calculate NRV for each product

Product	Selling price	Less: Selling costs	NRV	Cost	Lower of Cost & NRV
Alpha	$52	$3	$49	$45	$45 (Cost)
Beta	$70	$5	$65	$68	$65 (NRV)
Gamma	$88	$4	$84	$92	$84 (NRV)

Step 2: Calculate total inventory value

Product	Lower value per unit	Units	Total value
Alpha	$45	200	$9,000
Beta	$65	150	$9,750
Gamma	$84	100	$8,400
Total			$27,150

Marking scheme:

1 mark for correct NRV calculations for all three products
1 mark for correct identification of lower of cost and NRV for each product
1 mark for correct multiplication by units on hand
1 mark for correct total ($27,150)

Accept minor arithmetic errors with method marks.

10. Ahmad Trading calculations:
[4 marks total]

(a) Cost of sales for the year. [1 mark]

Cost of sales = Revenue − Gross profit
= $260,000 −$ 78,000 = $182,000

Award 1 mark for correct answer.

(b) Total purchases for the year. [2 marks]

Cost of sales = Opening inventory + Purchases − Closing inventory
$182,000 =$ 32,000 + Purchases − $28,000$ 182,000 = $4,000 + Purchases Purchases =$ 182,000 − $4,000 = **$ 178,000**

Award 1 mark for correct formula/approach, 1 mark for correct answer.

(c) Inventory turnover rate (to 2 decimal places). [1 mark]

Average inventory = ( $32,000 +$ 28,000) ÷ 2 = $30,000

Inventory turnover = $182,000 ÷$ 30,000 = 6.07 times

Award 1 mark for correct answer.

Section C: Structured Response (10 marks)

11. Jasmine Fashion Boutique FIFO calculations:
[6 marks total]

(a) Cost of closing inventory as at 31 January 2025 (FIFO). [4 marks]

Inventory movement:

Opening: 20 units @ $40
Jan 8 Purchase: 30 units @ $44 → Total: 50 units
Jan 15 Sale: 25 units → FIFO: 20 @ $40 + 5 @$ 44 → Remaining: 25 units @ $44
Jan 22 Purchase: 25 units @ $48 → Total: 50 units (25 @$ 44 + 25 @ $48)
Jan 28 Sale: 35 units → FIFO: 25 @ $44 + 10 @$ 48 → Remaining: 15 units @ $48

Closing inventory: 15 units × $48 = **$ 720**

Marking scheme:

1 mark for correct units after first sale (25 @ $44)
1 mark for correct units after second purchase (25 @ $44 + 25 @$ 48)
1 mark for correct units after second sale (15 @ $48)
1 mark for correct valuation ($720)

(b) Cost of sales for January 2025 (FIFO). [2 marks]

Cost of sales = (20 × $40) + (5 ×$ 44) + (25 × $44) + (10 ×$ 48)
= $800 +$ 220 + $1,100 +$ 480
= $2,600

Alternative: Total cost of goods available − Closing inventory = (20× $40 + 30×$ 44 + 25× $48) −$ 720
= ( $800 +$ 1,320 + $1,200) −$ 720
= $3,320 −$ 720 = $2,600

Award 1 mark for correct approach, 1 mark for correct answer.

12. PQR Ltd and STU Ltd comparison:
[5 marks total]

(a) Compare and comment on the inventory management of the two businesses. [3 marks]

Answer: STU Ltd has a higher inventory turnover rate (12 times) compared to PQR Ltd (8 times). This indicates that STU Ltd is selling its inventory more quickly, which suggests more efficient inventory management, lower holding costs, and reduced risk of obsolescence. However, PQR Ltd has a higher gross profit margin (35% vs 28%), which may indicate that PQR Ltd is selling at higher mark-ups or has better control over cost of goods sold. The lower turnover at PQR Ltd could be a deliberate strategy of holding more inventory to support higher selling prices or could indicate slower-moving stock.

Award 1 mark for each valid comparison/comment (maximum 3 marks). Must reference both ratios and provide meaningful interpretation.

(b) Explain one possible reason why PQR Ltd has a higher gross profit margin but a lower inventory turnover rate compared to STU Ltd. [2 marks]

Answer (any one of the following or similar valid reason):

PQR Ltd may be selling higher-quality or premium products that command higher selling prices, resulting in a higher gross profit margin, but these products may sell more slowly, leading to a lower inventory turnover rate.
PQR Ltd may hold higher inventory levels to ensure product availability and avoid stock-outs, which supports higher prices but slows turnover.
STU Ltd may adopt a low-price, high-volume strategy, resulting in lower margins but faster inventory turnover.

Award 2 marks for a well-explained reason linking both margin and turnover. Award 1 mark for a partially correct or incomplete explanation.

Section D: Extended Response (10 marks)

13. Define the term "net realisable value" (NRV) as it applies to inventory valuation.
[1 mark]

Answer: Net realisable value is the estimated selling price of inventory in the ordinary course of business, less any estimated costs of completion and estimated costs necessary to make the sale.

Award 1 mark for correct definition. Must mention selling price less costs to sell/completion.

14. State two possible causes of inventory shrinkage in a retail business.
[2 marks]

Answer (any two of the following or similar valid causes):

Theft by customers (shoplifting) or employees.
Damage or spoilage of goods.
Administrative errors in recording purchases, sales, or inventory counts.
Supplier fraud or short deliveries.

Award 1 mark for each valid cause (maximum 2 marks).

15. MegaMart inventory performance analysis:
[6 marks total]

(a) Explain two possible reasons for the decrease in the inventory turnover rate from 2024 to 2025. [4 marks]

Answer (any two of the following or similar valid reasons, 2 marks each):

Overstocking: MegaMart may have purchased excessive inventory relative to sales demand, leading to higher average inventory levels and a lower turnover rate.
Decline in sales: Sales may have decreased while inventory levels remained constant or increased, reducing the rate at which inventory is sold.
Slow-moving or obsolete inventory: Accumulation of inventory that is not selling well, possibly due to changing consumer preferences or product obsolescence.
Change in product mix: Introduction of slower-moving product lines or reduction in fast-moving items.
Economic downturn: Reduced consumer spending affecting overall sales volume.

Award 2 marks for each well-explained reason. Award 1 mark for a stated reason without adequate explanation.

(b) Despite the lower inventory turnover rate, the gross profit margin improved. Explain how this could occur. [2 marks]

Answer: The business may have increased its selling prices (mark-up) while maintaining or only slightly increasing its cost of goods sold. Higher selling prices can lead to a higher gross profit margin, but may also result in lower sales volume and slower inventory movement, hence a lower inventory turnover rate. Alternatively, the business may have shifted to selling higher-margin products that sell more slowly.

Award 2 marks for a clear explanation linking higher margins to lower turnover. Award 1 mark for a partially correct explanation.

16. Rainbow Gifts inventory error:
[3 marks total]

(a) State the effect of this error on the gross profit for the year ended 31 December 2024. [1 mark]

Answer: Gross profit for 2024 is understated by $4,800.

Explanation: Closing inventory understated → Cost of sales overstated → Gross profit understated.

(b) State the effect of this error on the gross profit for the year ended 31 December 2025, assuming no other errors. [1 mark]

Answer: Gross profit for 2025 is overstated by $4,800.

Explanation: Opening inventory understated → Cost of sales understated → Gross profit overstated.

(c) Explain why the error affects the profit of two accounting periods differently. [1 mark]

Answer: The closing inventory of one period becomes the opening inventory of the next period. An understatement of closing inventory in 2024 causes cost of sales in 2024 to be overstated (reducing profit). In 2025, the opening inventory is understated, which causes cost of sales to be understated (increasing profit). The error reverses in the following period.

Award 1 mark for explanation mentioning the carry-forward effect of inventory.

17. Explain the importance of using a consistent inventory costing method (such as FIFO) from one accounting period to the next.
[2 marks]

Answer: Consistency in inventory costing methods ensures that financial statements are comparable between accounting periods. Changing methods could distort profit figures and inventory values, making it difficult for users to assess trends and performance. The consistency concept requires that the same accounting methods be applied from period to period unless there is a valid reason for change, and any change must be disclosed.

Award 2 marks for a clear explanation referencing comparability and the consistency concept. Award 1 mark for a partial answer.

18. State one advantage and one disadvantage of using the First-In-First-Out (FIFO) method for inventory valuation.
[2 marks]

Answer:

Advantage: FIFO values closing inventory at the most recent purchase prices, so inventory on the balance sheet reflects current market values. It is also logical as it assumes the oldest goods are sold first, which often matches the physical flow of goods.
Disadvantage: During periods of rising prices, FIFO results in lower cost of sales and higher reported profit, which may lead to higher tax liabilities. It may also overstate profits if replacement costs are rising.

Award 1 mark for a valid advantage and 1 mark for a valid disadvantage. Accept other relevant points.

Answer: According to the lower of cost and net realisable value principle, inventory should be reported at the lower amount. Since NRV ( $46,000) is lower than cost ($ 50,000), the inventory must be written down by $4,000. The inventory should be reported at **$ 46,000** in the financial statements. The write-down is recognised as an expense (loss) in the income statement.

Award 1 mark for stating the inventory value ($46,000) and 1 mark for explaining the write-down treatment.

20. Distinguish between the periodic inventory system and the perpetual inventory system.
[2 marks]

Answer:

Periodic inventory system: Inventory is counted physically at the end of an accounting period to determine closing inventory and cost of sales. Purchases are recorded in a Purchases account, and inventory records are not updated continuously.
Perpetual inventory system: Inventory records are updated continuously with every purchase and sale. The Inventory account reflects the current balance at all times, and cost of sales is recorded at the time of each sale. Physical counts are still done periodically to verify records.

Award 1 mark for each correct distinction. Must mention the timing of updates and how cost of sales is determined.

END OF ANSWER KEY