Need help finding the double declining balance method, part C.

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 three years, or 4,320 operating hours, and a residual value of $1,080. The equipment was used for 800 hours during Year 1, 1,500 hours in Year 2, 1,300 hours in Year 3, and 720 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 8,640 Year 2 11,520 Year 3 11,520 Year 4 2,880 b. Units-of-activity method Amount