On January 1, 2018, a machine was installed at Jillian Factory at a cost of $58,000. Its estimated residual value at the end of its estimated life of 4 years is $22,000. The machine is expected to produce 180,000 units with the following production schedule:

2018: 37,000 units
2019: 35,000 units
2020: 41,000 units
2021: 67,000 units

Complete depreciation schedules for

(a) Straight-line,

(b) units of production,

(c) Double declining-balance at twice the straight-line rate methods.