Rottino Company purchased a new machine on October 1, 2015, at a cost of $145, 500. The company estimated that the machine will have a salvage value of $13, 500. The machine is expected to be used for 10, 700 working hours during its 4-years life. Compute the depreciation expense under straight-line method for 2015. Compute the depreciation expense under units-of-activity for 2015, assuming machine usage was 1, 900 hours