Answer:
the depreciation expense for the year 2021 under the units of activity method is $31,500
Step-by-step explanation:
The computation of the depreciation expense for the year 2021 under the units of activity method is as follows
= (Cost - residual value) × actual hours in 2021 ÷ total actual hours run
= ($387,000 - $72,000) × 3,600 hours ÷ 36,000 hours
= $31,500
hence, the depreciation expense for the year 2021 under the units of activity method is $31,500