12. Numo Company purchased a new machine on October 1, 2017, at a cost of $145,000. The company estimated that the machine will have a salvage value of $25,000. The machine is expected to be used for 20,000 working hours during its 5-year life. Instructions Compute the depreciation expense under the following methods for the year indicated. (a) Straight-line for 2017. (b) Units-of-activity for 2017, assuming machine usage was 3,400 hours