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Depreciation by three methods; partial years Perdue Company purchased equipment on April 1 for $48,870. The equipment was expected to have a useful life of 3 years, or 5,940 operating hours, and a residual value of $1,350. 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 final multiplier to four decimal places. Then, round the answer for each year to the nearest whole dollar. a. Straight-hine method b. Unitg-of-activity method c. Double-declining-balance method