Duluth Ranch, Inc. purchased a machine on January 1, 2018. The cost of the machine was $20,000. Its estimated residus value was $6,000 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 2018 and 1.250 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 Required Calculate depreciation expense for 2018 through 2022 using the double-declining balance method. (Round your final answer to nearest whole dollar.) 2018 2010 2020 2021 2022 Depreciation Expense