QUESTION 4 Comet, Inc. purchased a truck on March 25, 2019 for $90,000. The truck is estimated to have a salvage value of $3,600 and a useful life of 120,000 miles and five years. It was driven 18,000 miles in 2019 and 32,000 miles in 2020. Comet uses the units of activity method to calculate depreciation. Compute depreciation expense for 2019 and 2020 2019 Depreciation expense- 2020 Depreciation expense