On January 2, 2021, Archer Company, a skateboard manufacturer, installed a computerized machine in its factory at a cost of $150,200. The machine’s useful life was estimated at four years or a total of 186,000 units with a $20,000 trade-in value. Archer Company’s year-end is December 31. Calculate depreciation for each year of the machine’s estimated useful life under each of the following methods:

a. Straight-line

b. Double-declining-balance

c. Units-of-production, assuming actual units produced were:

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Year 2021 2022 2023 2024 Units 38,400 41,300 52,700 57,000