c. Double-declining-balance method Depreciation by three methods; partial years Perdue Company purchased equipment on April 1 for $55,620. The equipment was expected to have a useful life of 3 years, or 5,400 operating hours, and a residual value of $1,620. The equipment was used for 1,000 hours during Year 1, 1,900 hours in Year 2, 1,600 hours in Year 3, and 900 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 a. Straight-line method b. Units-of-activity method