Current Attempt in Progress Your answer is partially correct. The cost of equipment purchased by Skysong, Inc., on June 1, 2020, is $107,100. It is estimated that the machine will have a $6,300 salvage value at the end of its service life. Its service life is estimated at 7 years, its total working hours are estimated at 50,400, and its total production is estimated at 630,000 units. During 2020, the machine was operated 6,420 hours and produced 58,850 units. During 2021, the machine was operated 5,885 hours and produced 51,300 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.) 2020 2021 (a) Straight-line $ 8,400 $ 14,400 (b) Units-of-output $ 9,416 $ 8,208 (c) Working hours $ 12,904 $ 11,829 (d) Sum-of-the-years'-digits $ 14.700 $ 23,100 (e) Double-declining-balance (twice the straight-line rate) $ 17,850 $ 25,500 e Textbook and Media Save for Later Attempts: 2 of 3 used Submit