D. The Image Maker Mfg. Co. purchased equipment is equipment on January 1, 2017, at a cost of $800,000. The expected to have a service life of ten years, or 40,000 hours, and a residual value of $50,000. During 2017, the equipment was operated for 6,000 hours, and during 2018, it was operated for 8.,000 hours Required: Determine the depreciation expense for this machine in 2016 and 2017 under each of the following depreciation methods: 2017 2018 a. Straight-line method b. Activity method (hours ran) c. Double declining balance method d. Sum-of-the-years'-digits method Computations