Numo Company purchased a new machine on September 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 for the year 2017 according to the units-of-activity method, assuming machine usage was 3,100 hours.