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17.1 18.1 19 1 20 6. The Jefferson Co. purchased a machine on January 1, 2016. The machine cost $595,000. It had an estimated life of ten years, or 30,000 units, and an estimated residual value of $40,000. In 2016, Jeffries produced 3,000 units Required: Compute the depreciation charge for 2016 using each of the following methods: a. Double-declining-balance method b. Activity method (units of output) c. Sum-of-the-years'-digits method d. Straight-line method