Martin Company purchases a machine at the beginning of the year at a cost of $70,000. The machine is depreciated using the straight-line method. The machine's useful life is estimated to be 4 years with a $4,000 salvage value. Depreciation expense in year 4 is: Multiple Choice 8 01:09:00 $17,500. 0 $0. $70,000. $16,500. $66,000