On January 2, 2018, Archer Company, a skateboard manufacturer, installed a computerized machine in its factory at a cost of $160,800. The machine's useful life was estimated at four years or a total of 190,000 units with a $24,000 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: (Do not round intermediate calculations.) a. Straight-line b. Double-declining-balance c. Units-of-production, assuming actual units produced were: 30:50 Year Units 2018 38,500 2019 41,450 2020 52,800 2021 58,000