Solar Innovations Corporation bought a machine at the beginning of the year at a cost of $37,000. The estimated useful life was five years and the residual value was $4,500. Assume that the estimated productive life of the machine is 20,000 units. Expected annual production for year 1, 4,600 units; year 2, 5,600 units; year 3, 4,600 units; year 4, 4,600 units; and year 5, 600 units. Required: 1. Complete a depreciation schedule for each of the alternative methods. (Do not round intermediate calculations.) a. Straight-line. b. Units-of-production. c. Double-declining-balance.