On January 2, 2018, Country Lumber installed a computerized machine in its factory at a cost of S168,000. The machine's useful life was estimated at four years or a total of 190.000 units with a $35.000 trade in value Country Lumber'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 actiial units produced were: Year 2018 2019 2020 2021 Units 39,900 43,550 54,200 72.000