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Secondary 4 Principles of Accounts Inventory Costing Quiz

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Questions

Secondary 4 Principles of Accounts Quiz - Inventory Costing

Name: _________________________
Class: ________________________
Date: _________________________
Score: ________ / 50

Duration: 45 Minutes
Total Marks: 50

Instructions:

Answer all questions.
Show all workings clearly. Marks are awarded for method.
Round monetary values to two decimal places unless otherwise stated.
This quiz covers Inventory Valuation (FIFO, AVCO), Inventory Errors, and Inventory Ratios.

Section A: Multiple Choice & Short Concepts (Questions 1-5)

1. Which accounting concept requires inventory to be valued at the lower of cost and net realisable value?
A) Accruals Concept
B) Prudence Concept
C) Consistency Concept
D) Going Concern Concept
(1 mark)

2. In a period of rising prices, which inventory valuation method will result in the highest closing inventory value?
A) FIFO
B) AVCO (Weighted Average)
C) LIFO (Not permitted under SFRS)
D) Specific Identification
(1 mark)

3. Define Net Realisable Value (NRV).

(2 marks)

4. State one disadvantage of using the FIFO method for inventory valuation during inflation.

(1 mark)

5. If closing inventory is overstated by $500, what is the effect on the Gross Profit for the year? A) Understated by$ 500
B) Overstated by $500 C) No effect D) Overstated by$ 1,000
(1 mark)

Section B: Basic Calculations & Concepts (Questions 6-10)

6. Calculate the Cost of Sales given the following:
Opening Inventory: $2,000 Purchases:$ 15,000
Carriage Inwards: $500 Closing Inventory:$ 3,000
(2 marks)
Answer: $_____________

7. Which of the following costs should not be included in the cost of inventory?
A) Import duties
B) Carriage inwards
C) Carriage outwards to customers
D) Cost of conversion
(1 mark)

8. The formula for Inventory Turnover Rate is:
A) Cost of Sales / Average Inventory
B) Sales / Closing Inventory
C) Average Inventory / Cost of Sales
D) Gross Profit / Average Inventory
(1 mark)

9. Scenario: TechParts Pte Ltd sells electronic components. The following transactions occurred for Component X in October 2026.

Date	Transaction	Units	Unit Cost ($)
Oct 1	Opening Inventory	100	10.00
Oct 5	Purchase	200	12.00
Oct 12	Sale	150	-
Oct 20	Purchase	100	14.00
Oct 28	Sale	180	-

Required: Calculate the value of the Closing Inventory at 31 October 2026 using the FIFO (First-In, First-Out) method.
(6 marks)

10. Scenario: FreshFoods Ltd values its inventory using the AVCO method on a perpetual basis (recalculating the average after every purchase).

Date	Transaction	Units	Unit Cost ($)
Nov 1	Opening Inventory	50	4.00
Nov 4	Purchase	50	6.00
Nov 10	Sale	60	-

Required: Calculate the weighted average unit cost after the purchase on Nov 4.
(2 marks)

Section C: Advanced Calculations & Analysis (Questions 11-15)

11. Refer to the TechParts Pte Ltd scenario in Question 9.

Calculate the value of the Closing Inventory at 31 October 2026 using the AVCO (Weighted Average Cost) method. Assume the company uses the periodic inventory system (calculate average cost at the end of the month).
(6 marks)

12. Refer to the TechParts Pte Ltd scenario in Question 9.

Calculate the Cost of Sales for October 2026 using the FIFO method.
(4 marks)

13. Refer to the TechParts Pte Ltd scenario in Question 9.

Calculate the Cost of Sales for October 2026 using the AVCO (periodic) method.
(4 marks)

14. Refer to the FreshFoods Ltd scenario in Question 10.

Calculate the value of the Closing Inventory after the sale on Nov 10.
(2 marks)

15. Inventory Errors
During the preparation of the financial statements for the year ended 31 December 2026, it was discovered that the closing inventory was understated by $2,500 due to a counting error. The error was not corrected.

Required:
State the effect of this error on the Cost of Sales for the year ended 31 December 2026. Indicate whether it is Overstated, Understated, or No Effect.
(1 mark)

Section D: Financial Statement Effects & Ratios (Questions 16-20)

16. Refer to the error in Question 15 (Closing Inventory understated by $2,500).

State the effect of this error on the Gross Profit for the year.
(1 mark)

17. Refer to the error in Question 15 (Closing Inventory understated by $2,500).

State the effect of this error on the Net Profit for the year.
(1 mark)

18. Refer to the error in Question 15 (Closing Inventory understated by $2,500).

State the effect of this error on Current Assets (Working Capital) at year-end.
(1 mark)

19. Ratio Analysis
The following information is extracted from the financial statements of two competitors, Company A and Company B, for the year ended 31 December 2026.

	Company A	Company B
Revenue	$500,000	$500,000
Cost of Sales	$300,000	$300,000
Opening Inventory	$40,000	$20,000
Closing Inventory	$60,000	$20,000

Required: Calculate the Inventory Turnover Rate (times) for Company A. Show your workings.
(3 marks)

20. Refer to the data in Question 19.

Calculate the Inventory Turnover Rate (times) for Company B. Show your workings.
(3 marks)

End of Quiz

Answers

Secondary 4 Principles of Accounts Quiz - Inventory Costing (Answer Key)

Section A: Multiple Choice & Short Concepts

1. B) Prudence Concept
Explanation: The prudence concept ensures assets are not overstated. Inventory is valued at the lower of cost and NRV to prevent overvaluation of assets and profit.

2. A) FIFO
Explanation: In rising prices, the older (cheaper) costs are sold first (COGS is lower), leaving the newer (more expensive) costs in Closing Inventory. Thus, FIFO yields the highest closing inventory value.

3. Net Realisable Value (NRV) is the estimated selling price in the ordinary course of business, less the estimated costs of completion and the estimated costs necessary to make the sale.
(1 mark for selling price, 1 mark for less costs to sell)

4. Disadvantage of FIFO in inflation:
It results in higher reported profits (because COGS is based on older, lower costs), which leads to higher income tax payments.
(Alternatively: It may lead to distribution of profits that are not fully backed by current cash flows.)

5. B) Overstated by $500
Explanation: Closing Inventory is deducted from Cost of Sales. If Closing Inventory is too high (overstated), Cost of Sales is too low (understated). If Cost of Sales is understated, Gross Profit is overstated.

Section B: Basic Calculations & Concepts

6. ** $14,500** *Workings:* Opening Inventory ($ 2,000) + Purchases ( $15,000) + Carriage Inwards ($ 500) - Closing Inventory ( $3,000) =$ 14,500.

7. C) Carriage outwards to customers
Explanation: Carriage outwards is a selling expense (distribution cost), not a cost of bringing the inventory to its present location and condition.

8. A) Cost of Sales / Average Inventory

9. TechParts Pte Ltd (FIFO Closing Inventory)
Total Units Available: 100 + 200 + 100 = 400 units
Total Units Sold: 150 + 180 = 330 units
Closing Units: 400 - 330 = 70 units

Under FIFO, the closing inventory consists of the most recent purchases.
The 70 units come from the Oct 20 Purchase (100 units @ $14). Value = 70 units ×$ 14.00 = $980
(1 mark for units, 1 mark for identifying layer, 1 mark for calculation)

10. FreshFoods Ltd (Perpetual AVCO - Avg Cost)
Opening: 50 units @ $4.00 =$ 200
Purchase: 50 units @ $6.00 =$ 300
Total Value: $500 Total Units: 100 New Average Cost =$ 500 / 100 = $5.00 per unit
(1 mark for total value, 1 mark for division)

Section C: Advanced Calculations & Analysis

11. TechParts Pte Ltd (AVCO Periodic Closing Inventory)
Step 1: Calculate Total Cost of Goods Available for Sale
Oct 1: 100 × $10 =$ 1,000
Oct 5: 200 × $12 =$ 2,400
Oct 20: 100 × $14 =$ 1,400
Total Cost = $4,800
Total Units = 400

Step 2: Calculate Weighted Average Unit Cost
$4,800 / 400 units =$ 12.00 per unit

Step 3: Calculate Closing Inventory
70 units × $12.00 = **$ 840**
(2 marks for total cost, 1 mark for avg cost, 1 mark for final value)

12. TechParts Pte Ltd (FIFO Cost of Sales)
Method 1: Total Cost Available - Closing Inventory
$4,800 -$ 980 = $3,820

Method 2: Specific Identification
Sale 1 (150 units): 100 @ $10 + 50 @$ 12 = $1,000 +$ 600 = $1,600 Sale 2 (180 units): 150 @$ 12 (remaining from Oct 5) + 30 @ $14 =$ 1,800 + $420 =$ 2,220
Total COGS = $1,600 +$ 2,220 = $3,820
(2 marks for workings, 2 marks for answer)

13. TechParts Pte Ltd (AVCO Periodic Cost of Sales)
Units Sold = 330
Average Cost = $12.00 COGS = 330 ×$ 12.00 = * $3,960** *(Alternatively:$ 4,800 Total Cost - $840 Closing Inv =$ 3,960)
(2 marks for workings, 2 marks for answer)

14. FreshFoods Ltd (Perpetual AVCO - Closing Inventory Value)
Units Remaining: 100 - 60 = 40 units
Value = 40 units × $5.00 (current average from Q10) = **$ 200**
(1 mark for remaining units, 1 mark for valuation)

15. Inventory Errors (Understated Closing Inventory by $2,500) - Effect on Cost of Sales
Overstated
(Because Closing Inv is subtracted; if it is too small, COGS is too big)
(1 mark)

Section D: Financial Statement Effects & Ratios

16. Effect on Gross Profit
Understated
(1 mark)

17. Effect on Net Profit
Understated
(1 mark)

18. Effect on Current Assets
Understated
(1 mark)

19. Company A Inventory Turnover Rate
Formula: Cost of Sales / Average Inventory
Average Inventory = (Opening + Closing) / 2

Avg Inv = ( $40,000 +$ 60,000) / 2 = $50,000 Turnover =$ 300,000 / $50,000 = 6 times
(1 mark for avg inv, 1 mark for formula/substitution, 1 mark for answer)

20. Company B Inventory Turnover Rate
Avg Inv = ( $20,000 +$ 20,000) / 2 = $20,000 Turnover =$ 300,000 / $20,000 = 15 times
(1 mark for avg inv, 1 mark for formula/substitution, 1 mark for answer)