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4. Jasper Corporation purchased machinery on January 1, 2012, at a total cost of $92,000. The machinery's estimated useful life is 4 years or 60,000 hours, and its residual value is $8,000. During 2012, 2013, 2014 and 2015, the machinery was used 17,750, 16,875 and 18,250, and 7125 hours, respectively. Compute the depreciation under straight-line, and units-of-production for 2012, 2013, 2014 and 2015. Show your calculations (4 marks) Straight Line Units of Production