A production machine which cost $2, 200,000 is acquired on October 1, 2016. Its estimated residual value is $200 000 and its expected life a 10 years or about 80.000 operating hours. During 2016, the machine was used to produce products for 3.000 operating hours during 2016 and 8, 100 operating hours during2017. Calculate depreciation expense for 2016 and 2017 by each of the following method: Straight-line method Double-declining balance method Units-of-output method