Depreciation by three methods; partial years Perdue Company purchased equipment on April 1 for $55,080. The equipment was expected to have a useful life of 3 years, or 4,860 operating hours, and a residual value of $1,620. The equipment was used for 900 hours during Year 1, 1,700 hours in Year 2, 1,500 hours in Year 3, and 760 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.

I need help with C. year 1 & year 4. thanks

a. Straight-line method b. Units-of-activity method c. Double-declining-balance method