Depreciation by Three Methods; Partial Years Perdue Company purchased equipment on April 1 for $73,440. The equipment was expected to have a useful life of three years, or 5,940 operating hours, and a residual value of $2,160. The equipment was used for 1,100 hours during Year 1, 2,100 hours in Year 2, 1,800 hours in Year 3, and 940 hours in Year 4. Required: Determine the amount of depreciation expense for the years ended December 31, Year 1, Year 2, Year 3, and Year 4, by (a) the straight-line method, (b) the units-of-activity method, and (c) the double-declining-balance method. Note: FOR DECLINING BALANCE ONLY, round the multiplier to four decimal places. Then round the answer for each year to the nearest whole dollar. a. Straight-line method Year Amount Year 1 Year 2 $ $ $ $ 23,760 X 23,760 23,760 23,760 x Year 3 Year 4 b. Units-of-activity method Year Amount Year 1 $ 13,200 Year 2 $ 25,200 Year 3 $ 21,600 Year 4 $ 11,280 C. Double-declining-balance method Year Amount Year 1 $ $ 48,960 x 16,320 x Year 2 Year 3 $ 5,400 Year 4 $ 8,160