On January 2, 2021, 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 180,000 units with a $24,000 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.)

Straight-line

Double-declining-balance

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

Year 2021 2022 2023 2024

Units 39,700 43,250 54,000 70,000