Sketches Inc. purchased a machine on January 1, 2016. The cost of the machine was $20,000. Its estimated residual value was $8,000 at the end of an estimated 5-year life. The company expects to produce a total of 20,000 units. The company produced 800 units in 2016 and 1,250 units in 2017 Calculate depreciation expense for 2018 and 2017 using the straight-line method. Calculate the depreciation expense for 2016 and 2017 using the units-of-production method. (Do not round your intermediate calculations. Round your final answers to the nearest whole dollar.) Calculate depreciation expense for 2010 through 2020 using the double-declining balance method. (Round your final answer to nearest dollar value.)