Rotting Company purchased a new machine on October 1, 2015, at a cost of $113, 800. The company estimated that the machine will have a salvage value of $10, 600. The machine is expected to be used for 11, 200 working hours during its 5-years life. Compute the depreciation expense under straight -line method for 2015. Straight-line method Compute the depreciation expense under units-of-activity for 2015, Assuming machine usage was 1, 800 hours. Units-of-activity method Compute the depreciation expense under declining-balance using double that straight-line rate for 2015 and 2016