Purity Ice Cream Company bought a new ice cream maker at the beginning of the year at a cost of $8,000. The estimated useful life was four years, and the residual value was $900. Assume that the estimated productive life of the machine was 10,000 hours. Actual annual usage was 3,700 hours in year 1: 3,000 hours in year 2, 2.100 hours in year 3; and 1,200 hours in year 4. Required: Complete a separate depreciation schedule by using Straight-line method.