Final answer:
The amount Able could use for depreciation is $150,000.
Step-by-step explanation:
The amount Able could use for depreciation is the cost of the building, excluding the value of the land and any salvage value.
In this case, the cost of the building is the purchase price of $200,000, minus the value of the land ($40,000) and the salvage value ($10,000). So, the amount Able could use for depreciation is $150,000.