Cost of the equipment is $21,000

Life of the machine in hours is 100,000 hours

Salvage (residual) value is 1,000

Life of the machine in years is 4 years

1. Calculate Double Declining Depreciation Expense for years 1 and 2

2. Caclulate depreciation Expense using Units of production for year 1 (10,000 hours were used) and year 2 (15,000 hours were used)

3. Calculate Straight line Depreciation Expense for years 1 and 2