Sketches Inc. purchased a machine on January 1,2016. The cost of the machine was $42,500. Its estimated residual value was $13,500 at the end of an estimated 5-year life. The company expects to produce a total of 10.000 units. The company produced 1,550 units in 2016 and 2,000 units in 2017. a. Calculate depreciation expense for 2016 and 2017 using the straight-line method. b. Calculate the depreciation expense for 2016 and 2017 using the units-of-production method. c. Calculate depreciation expense for 2016 through 2020 using the double-declining balance method