A machine costing $250,000 with a five-year life and an estimated $25,000 salvage value is installed in Sun Companys factory on January 1. The factory manager estimates the machine will produce 400,000 units of product during its life. It actually produces the following units: year 1-100,000, year 2-120,000 and year 3-20,000 units.

Prepare depreciation schedules computing depreciation for the first 3 years under the straight-line method and units of production method.