Perdue Company purchased equipment on April 1 for $39,690. The equipment was expected to have a useful life of 3 years, or 7,020 operating hours, and a residual value of $1,080. The equipment was used for 1,300 hours during Year 1, 2,500 hours in Year 2,2,100 hours in Year 3 , and 1,120 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-1,ne method, (b) the units-ofactivity method, and (c) the double-decining-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-line method b. Units-of-activity method b. Units-of-activity method c. Double-declining-balance method