I am stuck on the double declining method of this question. all of the others I have completed.

Depreciation by Three Methods; Partial Years

Perdue Company purchased equipment on April 1 for $35,100. The equipment was expected to have a useful life of three years, or 7,560 operating hours, and a residual value of $1,080. 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 multiplier to four decimal places. Then round the answer for each year to the nearest whole dollar.