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Sheffield Corporation purchased a truck at the beginning of 2020 for $58.500. The truck is estimated to have a salvage value of $2,340 and a useful life of 187,200 miles. It was driven 26,910 miles in 2020 and 36,270 miles in 2021. Compute depreciation expense using the units-of-production method for 2020 and 2021 Depreciation expense for 2020 $ Depreciation expense for 2021 $ Tamarisk Company purchased machinery on January 1, 2020, for $92,800. The machinery is estimated to have a salvage value of $9.280 after a useful life of 8 years. (a) Compute 2020 depreciation expense using the straight-line method. Depreciation expense $