Cullumber Company purchased a new machine on October 1, 2017, at a cost of $66,000. The company estimated that the machine has a salvage value of $7, 140. The machine is expected to be used for 72,000 working hours during its 6-year life. Compute the depreciation expense under the straight-line method for 2017 and 2018, assuming a December 31 year-end. (Round answers to O decimal places, e.g. 5, 275.)