How do I do the double-declining-balance method?

Depreciation by Three Methods; Partial Years Perdue Company purchased equipment on April 1 for $75 060. The equipment was expected to have a useful fe of three years or 5,400 operating hours and a residual value of2,160 The equipment was used for 1 000 hours during Year 1, 1,900 hours in Year 2, 1,600 hours in Year 3, and 900 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) units-of-output method, and ()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 a. Straight-line method Year Amount Year 1 18,22 Year 2 24,30 Year 3 24,30 Year 4 6,075 b. Units-of-output method Year Amount Year 1 13,50 Year 2 25,65 Year 3 21,60 12,15 Year 4 Year Year 1 Year 2 Year 3 Year 4 Amount 37,53