On March 31, 2016, 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, 0 hours. Calculate depreciation expense for 2016 and 2017 using straight line method. Calculate depreciation expense for 2016 and 2017 using sum-of-the- years-digits method. Calculate depreciation expense for 2016 and 2017 using double-declining balance method