Swifty Corporation purchased a new machine for its assembly process on August 1, 2020. The cost of this machine was $125,100. The company estimated that the machine would have a salvage value of $17,100 at the end of its service life. Its life is estimated at 5 years, and its working hours are estimated at 20,000 hours. Year-end is December 31. Compute the depreciation expense under the following methods. (c) Sum-of-the-years'-digits for 2021 (d) Double-declining-balance for 2021