Answer:
Perdue Company
Depreciation expense for the years ended December 31:
                        Year 1   Year 2     Year 3     Year 4
a) Straight-line method      $11,700   $11,700    $11,700      $0
b) Units-of-activity method   $6,500   $12,500   $10,500    $5,600
                     ($5 x 1,300) ($5 x 2,500) ($5 x 2,100) ($5 x 1,120)
c) Double-declining method  $24,121   $8,040    $2,939     $0
1st year = $36,180 * 0.6667 = $24,121
2nd year = $12,059 * 0.6667 = $8,040
3rd year = ($36,180 - 24,151 - 8,040 - 1,080) = $2,939
Explanation:
a) Data and Calculations:
April 1 Purchased Equipment = $36,180
Useful life = 3 years or 7,020 operating hours
Residual value = $1,080
Depreciable amount = $35,100
Under Straight-line method, depreciation rate per annum = $11,700 ($35,100/3).
Under the units-of-activity method, the depreciation rate per hour = $5 ($35,100/7,020).
Under the double-declining method, the depreciation percent = 0.6667 (100/3) * 2.
The double-declining method does not consider the residual value at the beginning, but at the end of the computation.