Perdue company purchased equipment on april 1 for $65,070. the equipment was expected to have a useful life of three years, or 7,020 operating hours, and a residual value of $1,890. the equipment was used for 1,300 hours during year 1, 2,500 hours in year 2, 2,100 hours in year 3, and 1,120 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.