Wildhorse Co. purchased a new machine on October 1, 2017, at a cost of $88,000. The company estimated that the machine has a salvage value of $8,400. The machine is expected to be used for 71,500 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 decimal places, eg. 5,275.) 2017 2018 The depreciation expense under the straight-line method $