6. Mohr Company purchases a machine at the beginning of the year at a cost of $40,000. The machine is depreciated using the double-declining-balance method. The machines useful life is estimated to be 5 years with a $6,000 salvage value. The machines book value at the end of year 2 is:

8. Martin Company purchases a machine at the beginning of the year at a cost of $63,000. The machine is depreciated using the straight-line method. The machines useful life is estimated to be 5 years with a $5,000 salvage value. Depreciation expense in year 4 is:

9. Martin Company purchases a machine at the beginning of the year at a cost of $80,000. The machine is depreciated using the straight-line method. The machines useful life is estimated to be 5 years with a $5,000 salvage value. The book value of the machine at the end of year 5 is:

10. Martin Company purchases a machine at the beginning of the year at a cost of $80,000. The machine is depreciated using the double-declining-balance method. The machines useful life is estimated to be 4 years with a $6,600 salvage value. The machines book value at the end of year 3 is: