Mohr Company purchases a machine at the beginning of the year at a cost of $31,000. The machine is depreciated using the double-declining balance method. The machine's useful life s estimated to be 5 years with a $4,000 salvage value. Depreciation expense in year 2 is:
a. $18.600
b. $6,200
c. $10,000
d. $7,440
e. $12,400