Answer:
the depreciation that should be charged over the useful life each year is $20,000
Step-by-step explanation:
The computation of the depreciation expense using the straight line method is shown below:
= (Purchase cost of an equipment - residual value) ÷ (useful life)
= ($135,000 - $15,000) ÷ 6 years
= $120,000 ÷ 6 years
= $20,000
hence, the depreciation that should be charged over the useful life each year is $20,000