On January 1, 2018, Poultry Processing Company purchased a freezer and related installation equipment for $60,000. The equipment had a three-year estimated life with a $4,200 salvage value. Straight-line depreciation was used. At the beginning of 2020, Poultry Processing revised the expected life of the asset to four years rather than three years. The salvage value was revised to $3,200. Required Compute the depreciation expense for each of the four years, 2018-2021 Depreciation Expense 2018 2019 2020 2021