Alternative depreciation methods-straight-line, double-declining-balance, and units-of. production 102 CHECK FIGURES: b.2019=$37,550; c. 2020=$36,890 On January 2, 2018, 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: