Duluth Ranch, Inc. purchased a machine on January 1, 2018. The cost of the machine was $47,000. Its estimated residual value was $15,000 at the end of an estimated 5-year life. The company expects to produce a total of 20,000 units. The company produced 1,700 units in 2018 and 2,150 units in 2019. Required: a. Calculate depreciation expense for 2018 and 2019 using the straight-line method. b. Calculate the depreciation expense for 2018 and 2019 using the units-of-production method. c. Calculate depreciation expense for 2018 through 2022 using the double-declining balance method. Complete this question by entering your answers in the tabs below. Required A Required B Required C Calculate depreciation expense for 2018 and 2019 using the straight-line method. 2018 2019 Depreciation Expense Per Year