Depreciation by three methods; partial years Perdue Company purchased equipment on April 1 for $35,640. The equipment was expected to have a useful life of 3 years, or 4,320 operating hours, and a fesiloual value of $1,080. The equipment was used for 800 hours during Year 1,1,500 hours in Year 2,1,300 hours in Ycar 3 , and 720 hours in Year 4. Required: Determine the amount of deprecation expense for the years ended December 31, Year 1, Year 2 , Year 3 , and Year 4 , by (a) the straightine method, (b) the units-of-activity method, and (c) the double-declining-balonoe 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-line method b. Units-of-activity method c. Double-declining-balance method