Answer
Depreciation base = 162,000 - 15,000 = 147,000.00.
1. Straight line method = 147,000/20 = 7,350 Per Year
2. Output units method = (147,000/84000)*20,000 = 35,000.00
3. Work hours method = (147,000/42,000) * 14,300 = 50,050.00
4. Sum of years method
a. {20(20+1)}/2 = 210
b. 147,000 * 20/210 = 14,000.00
5. Double declining balance = 162,000*10/100 = 16,200
Work Step by Step
As summarized above.