Mohr Company purchases a machine at the beginning of the year at a cost of $24,000. The machine is depreciated using the double-declining balance method. The machine's useful life is estimated to be 5 years with a $4,000 salvage value. The machine's book value at the end of year 2 is: Multiple Choice $12.000 $7.200 $9.500 $8,640 $14,400