Depreciation by three methods; partial years Perdue Company purchased equipment on April 1 for $66,690. The equipment was expected to have a useful life of 3 years, or 6,480 operating hours, and a residual value of $1,890. The equipment was used for 1,200 hours during Year 1,2,300 hours in Year 2,1,900 hours in Year 3, and 1,080 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-ofactivity method, and (c) the double-deciling-balance method. Note: FOR DECLINING BALANCE ONLY, round the final multiplier to four decimal piaces. Then, round the answer for each year to the nearest whole dollar. a. Straight-line method b. Units-of-activity method c. Double-declining-balance method