A machine cost $120000 on April 1, 2015. Its estimated salvage value is $10000 and its expected life is 3 years and productive life in hours is 50000 hours.

Calculate the depreciation expense (to the nearest dollar) by each of the following methods, showing the figures used.

(b)Straight-line for 2015 ,2016 and 2017.

(c)Double-declining balance for 2015 ,2016 and 2017

(d)Sum-of-the-years'-digits for 2015 ,2016 and 2017