Cullumber Ltd. purchased a new machine on April 4, 2017, at a cost of $184,000. The company estimated that the machine would have a residual value of $16,000. The machine is expected to be used for 10,000 working hours during its four-year life. Actual machine usage was 1.500 hours in 2017: 2,400 hours in 2018: 2,000 hours in 2019; 2.200 hours in 2020; and 1,900 hours in 2021. Cullumber has a December 31 year end.