Answer:
It is $30,000(C)
Explanation:
Depreciable cost = $90,000
Using straight-line method,
Annual depreciation = $90,000/3
= $30,000.
Hence, depreciation expense at the final year of service is $30,000
We cannot make use of entire cost of equipment of $120,000 because it seemed the company wanted to sell its scrap value for $30,000. Hence, this has been used to reduced it cost to $90,000 which is a depreciable cost .