On January 1, Canseco Plumbing Fixtures purchased equipment for $30,000. Residual value at the end of an estimated four-year service life is expected to be $2,000. The company expects the machine to operate for 10,000 hours. Calculate depreciation expense for all four years using each of the following depreciation methods: (a) straight-line, (b) units-of-production, and (c) double-declining balance. The machine operated as outlined in the chart below. 3. 4 Year Machine 2700 2800 2500 2000 Hours