Strong Metals Inc. purchased a new stamping machine at the beginning of the year at a cost of $600,000. The estimated residual value was $51,900. Assume that the estimated useful life was five years, and the estimated productive life of the machine was 261,000 units. Actual annual production was as follows:

Year	Units
1	74,000
2	63,000
3	31,000
4	54,000
5	39,000

Required:

1. Complete a separate depreciation schedule for each of the alternative methods. (Do not round your intermediate calculations.)

a. Straight-line.

b. Units-of-production

c. Double-declining-balance.