Computing Depreciation Expense for Change in Useful Life Phelps company purchases equipment on January 1, 2019. for $21.600 which will be depreciated using the sum of years digits method. The equipment has a rosid value of 53,600 and a useful life of three years. In 2020, Phelps decides that the machine has an original total usulife of four years and 100 salvage value. What is depreciation expense for 20202 Depreciation expense for 2020: $ 19,800 X Check