Answer:
The depreciable cost of the equipment is b. $75,000
Step-by-step explanation:
Depreciable cost is the amount of an asset's cost that will be depreciated. Depreciable cost is calculated by total cost (purchase cost, installation cost, ...) of an asset minus its estimated salvage value.
Depreciable cost = Cost - salvage value = $90,000 - $15,000 = $75,000
From Depreciable cost, the company uses a depreciation method to charge depreciable cost to expense over the useful life of the equipment.