A machine was purchased on January 4, 2020 at a cost of $130,000. Management indicates that the machine should have a useful life of 8 years and a salvage 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 straight-line method of depreciation. b. The company uses the double declining balance method of depreciation. c. The company uses the sum-of-the-years digits method of depreciation..