On January 1, 2018, Shamrock Company purchased a computer system for $31,500. The system had an estimated useful life of 5 years and no salvage value. At January 1, 2020, the company revised the remaining useful life to two years. The company uses the straight-line method of depreciation. What amount of depreciation will be recorded for 2020 and 2021? Depreciation expense for 2020 $enter a dollar amount Depreciation expense for 2021 $enter a dollar amount