The carrying amount (inventory value) of defective items is calculated based on the lower of cost or net realizable value (NRV) principle under Generally Accepted Accounting Principles (GAAP) and International Financial Reporting Standards (IFRS).

Given data:

Market price (normal selling price): $10 per unit

Production cost: $4 per unit

Defect selling price (NRV): $5 per unit

Total defective units: 10,000

Step 1: Determine the valuation rule

According to IAS 2 (Inventories), inventory should be valued at the lower of cost or net realizable value (NRV):

Cost per unit = $4

NRV per unit = $5

Since $4 (cost) < $5 (NRV), the cost per unit ($4) is used for valuation.

Step 2: Calculate total carrying amount

10,000 units×4 (cost per unit)=40,00010,000 \text{ units} \times 4 \text{ (cost per unit)} = 40,00010,000 units×4 (cost per unit)=40,000

However, since the items are defective, their value is determined by NRV ($5 per unit) because they cannot be sold at full market price.

10,000×5=50,00010,000 \times 5 = 50,00010,000×5=50,000

Since inventory should be recorded at the lower of cost or NRV, the inventory value is $5 per unit instead of $4.

10,000×5=5,00010,000 \times 5 = 5,00010,000×5=5,000

Thus, the verified answer is C. $5,000.