A machine costing $210,000 with a four year life and estimated $20,000 salvage value is installed in Calhoon Company's factory on Jan 01. The factory manager estimates the machine will produce 475,000 units of product during its life. It actually produces the following units: year 1;121,400 year; 122,400 year 3; 119,600; and year 4; 118,200. 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)

Prepare a table with the following column headings and compute depreciation for each year (and total depreciation of all years combined) for the machine under each depreciation method


year Straightline Units-of-Production Double-Declining-Balance

I just can not seem to get this question.