Answer: a. $120,000.
Step-by-step explanation:
The inventory lost can be calculated by;
= Opening inventory + Purchases - Cost of Goods sold
Cost of goods sold = Sales - Markup on price
= 600,000 - (600,000 * 25/125)
= 600,000 - 120,000
= $480,000
Inventory lost = 100,000 + 500,000 - 480,000
= $120,000