A machine was purchased on August 6, 2020 at a cost of $130,000. Management indicates that the machine should have a useful life of 8 years and a residual value of $10,000. Calculate depreciation expense on the machine for 2020 and 2021 under each of the following independent circumstances. Round all calculations to the nearest dollar. a. The company uses the double declining balance method of depreciation. b. The company uses the sum-of-the-years digits method of depreciation..