In: Accounting
  | 
Straight line method
Annual depreciation = cost – residual value / estimated life = (111200-7200)/3 = 34666.67
Depreciation year 1 = 34667
Depreciation year 2 = 34667
Depreciation year 3 = 34666
Units of activity method
Deprecation rate per unit = (cost – residual value) / estimated units produced = (111200-7200)/20000 = 5.2
Depreciation year 1 = 8680*5.20 = 45136
Depreciation year 2 = 7360*5.20 = 38272
Depreciation year 3 = 3960*5.20 = 20592
Double declining method
Deprecation rate = 1/ estimated life * 2 = 1/3*2 = 0.66667
Deprecation year 1 = 111200*0.66667 = 74134
Deprecation year 2 = (111200-74134)*0.66667 = 24711
Deprecation year 3 = (111200-74134-24711-7200) = 5155
Part 1
Depreciation expense
| 
 year  | 
 Straight line method  | 
 Units of activity method  | 
 Double declining method  | 
| 
 Year 1  | 
 34667  | 
 45136  | 
 74134  | 
| 
 Year 2  | 
 34667  | 
 38272  | 
 24711  | 
| 
 Year 3  | 
 34666  | 
 20592  | 
 5155  | 
| 
 Total  | 
 104000  | 
 104000  | 
 104000  | 
Part 2
Answer is option C
Double-declining-balance method
Part 3
Answer is option D
All three depreciation methods (all have equal amount of depreciation)