On January 2, 2018, Archer Company, a skateboard manufacturer, installed a computerized machine in its factory at a cost of $168,000. The machines useful life was estimated at four years or a total of 190,000 units with a $35,000 trade-in value. Archer Companys year-end is December 31. Calculate depreciation for each year of the machines estimated useful life under each of the following methods: (Do not round intermediate calculations.)

1. Straight-line
2. Double-declining-balance
3. Units-of-production, assuming actual units produced were:

Year		2018		2019		2020		2021
Units		39,900		43,550		54,200		72,000