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on January 1, 2013, a machine was purchased for $90,000. The machine has an estimated residual value of $6,000 and an estimated useful life of 5 years. The machine can operate for 00,000 hours before it needs to be replaced. The company closed its books on December 31 and operates the machine as follows: 2013, 20,000 hours; 2014, 25,000 hours; 2015, 15,000 3 hours; 2016, 30,000 hours; and 2017, 10,000 hours (a) Compute the annual depreciation charges over the machine's life assuming a December 5 31 year-end for each of the following depreciation methods