Martin Company purchases a machine at the beginning of the year at a cost of $60,000. The machine is depreciated using the double-declining-balance method. The machines useful life is estimated to be 4 years with a $5,000 salvage value. Depreciation expense in year 4 is: Multiple Choice

$13,750.

$3,750.

$30,000.

$2,500.

$5,000.