Cullumber Company purchased a new machine on October 1, 2017, at a cost of $90,880. The company estimated that the machine has a salvage value of $8,640. The machine is expected to be used for 72,700 working hours during its 8-year life. Compute the depreciation expense under the straight-line method for 2017 and 2018, assuming a December 31 year-end. (Round answers to 0 decimal places, e.g. 5,275.) 2017 2018 The depreciation expense under the straight-line method $ $