Depreciation by three methods; partial years Perdue Company purchased equipment on April 1 for $81,810. The equipment was expected to have a useful life of 3 years, or 7,560 operating hours, and a residual value of $2,430. The equipment was used for 1,400 hours during Year 1, 2,600 hours in Year 2, 2,300 hours in Year 3, and 1,260 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-line method Year Amount Year 1 $fill in the blank 1 Year 2 $fill in the blank 2 Year 3 $fill in the blank 3 Year 4 $fill in the blank 4 b. Units-of-activity method Year Amount Year 1 $fill in the blank 5 Year 2 $fill in the blank 6 Year 3 $fill in the blank 7 Year 4 $fill in the blank 8 c. Double-declining-balance method Year Amount Year 1 $fill in the blank 9 Year 2 $fill in the blank 10 Year 3 $fill in the blank 11 Year 4 $fill in the blank 12