A machine costing $490,000 with a four-year life and an estimated $30,000 salvage value is installed in Calhoon Company’s factory on January 1. The factory manager estimates the machine will produce 575,000 units of product during its life. It actually produces the following units: year 1, 157,000; year 2, 143,000; year 3, 140,000; and year 4, 138,000. The total number of units produced by the end of year 4 exceeds the original estimate—this difference was not predicted. (The machine must not be depreciated below its estimated salvage value.)
Compute depreciation for each year (and total depreciation of all years combined) for the machine under each depreciation method.