Answer and Explanation:
The computation of the depreciation expense using straight line method is shown below:
Formula to be used:
= (Purchase cost - salvage value) ÷ (estimated service life)
For 2021
= ($35,000 - $5,000) ÷ (10 years)
= $3,000
For 4 months, it would be
= $3,000 × 4 months ÷ 12 months
= $1,000
And, for the year 2021, it would be the same i.e. $3,000