the netbook value at acquisiton is missing. this is what i need help with

Shining Cookie Company, Inc., in Murfreesboro, TN bought a new ice cream maker at the beginning of the year at a cost of $24,000. The estimated useful life was four years, and the residual value was $2,580 Assume that the estimated productive life of the machine was 10,200 hours. Actual annual usage was 4,080 hours in year 1; 3,060 hours in year 2; 2,040 hours in year 3; and 1,020 hours in year 4 Required: 1. Complete a separate depreciation schedule for each of the alternative methods. (Do not round intermediate calculations.) a. Straight-line Depreciation Accumulated Net Book Value Year Expensc 5,355$ 5,355 S 5,355 S10,710$ 5,355 S 16,065 5,355 S 21,420$ 18,645 13,290 7,935 2,580 b. Units-of-production (use four decimal places for the per unit output factor). tion Year Book Value At acquisition 8,568 S 6,426 S 4,284 S 2,142 S 8,568 $ 4,994$ 19,278 21,420$ 15,342 9,006 4,722 2,580 c. Double-declining-balance Depreciation Accumulated Net Book Value Year ense De 12,000 S 12,000 $ 6,000 S 18,000 3,000 S 21000 12,000 6,000 3,000