Calculations for various depredation methods. Alcoa acquires a machine for $88,800. It expects the machine to last six years and to operate for 30,000 hours during that time. Estimated salvage value is $4,800 at the end of the machine’s useful life. Calculate the depreciation charge for each of the first three years using each of the following methods:

a. The straight-line (time) method.

b. The straight-line (use) method, with the following operating times: first year. 4,500 hours; second year, 5,000 hours; third year, 5,500 hours.