sketches inc. purchased a machine on january 1, 2016. the cost of the machine was $17,000. its estimated residual value was $5,000 at the end of an estimated 5 year life. the company expects to produce a total of 20,000 units. the company produced 2,500 units in 2016 and 3,200 in 2017.

a. calculate depreciation expense using the straight line method

b. calculate depreciation expense using the units of production method

c. calculate depreciation expense using the double declining balance method