Martin Company purchases a machine at the beginning of the year at a cost of $160,000. The machine is depreciated using the double-declining-balance method. The machine's useful life is estimated to be 4 years with a $13,300 salvage value. The machine's book value at the end of year 3 is: Multiple Choice $80,000. $120,000. $140,000. $20,000 $18,325