ETO- GB Odeers Company purchased a new machine on October 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 under the following methods for the year indicated . ( a ) Straight - line for 2017 . ( b ) Units - of - activity for 2017 , assuming machine usage was 3, 410 hours . ( C ) Declining -balance using double the straight - line rate for 2017 and 2018