Answer:
C) $80,000
Explanation:
Since Rose uses the LIFO method for determining COGS, the 10,000 units sold should be recorded at $7.90 (purchase price 1/5).
10,000 units still remain in inventory (8,000 beginning + 2,000 last purchase). Using the LIFO costing method the inventory unit cost should be [(8,000 x $8.20) + (2,000 x $7.90)] / 10,000 = $8.14 per unit
If the replacement cost is $8 per unit, and Rose decides to use lower-of-cost-or-market rule, then she should use the lowest cost which is the replacement cost ($8 < $8.14).
So the ending inventory's total cost is $8 per unit x 10,000 units = $80,000