Answer:
purchase cost $86,670
useful life 3 years, 6,480 operating hours
residual value $2,430
a. the straight-line method
depreciation expense per year = ($86,670 - $2,430) / 3 = $28,080
- depreciation year 1 = $28,080 x 9/12 = $21,060
- depreciation year 2 = $28,080
- depreciation year 3 = $28,080
- depreciation year 4 = $28,080 x 3/12 = $7,020
b. units-of-output method.
depreciation per hour = ($86,670 - $2,430) / 6,480 = $13
- depreciation year 1 = 1,200 x $13 = $15,600
- depreciation year 2 = 2,300 x $13 = $29,900
- depreciation year 3 = 1,900 x $13 = $24,700
- depreciation year 4 = 1,080 x $13 = $14,040
c. the double-declining-balance method.
- depreciation year 1 = 2 x 1/3 x $86,670 x 9/12 = $43,335
- depreciation year 2 = $14,445 + (2 x 1/3 x $28,890 x 9/12) = $28,090
- depreciation year 3 = $4,815 + (2 x 1/3 x $9,630 x 9/12) = $9,630
- depreciation year 4 = $1,605 + ($3,210 - $2,430) = $2,385