The cost of equipment purchased by Charleston, Inc., on June 1,2020 , is $89,000. It is estimated that the machine will have a $5,000 salvage value at the end of its service life. Its service life is estimated at 7 years, its total working hours are estimated at 42,000 , and its total production is estimated at 525,000 units. During 2020 , the machine was operated 6,000 hours and produced 55,000 units. During 2021 , the machine was operated 5,500 hours and produced 48,000 units. Compute depreciation expense on the machine for the year ending December 31,2020 , and the year ending December 31, 2021, using the following methods. (Round depreciation per unit to 2 decimal places, e.g. 15.25 and final answers to 0 decimal places, e.g. 45,892.)