1. Razar Sharp Company purchased equipment on July 1, 2014, for $50,490. The equipment was expected to have a useful life of three years, or 7,560 operating hours, and a residual value of $1,350. The equipment was used for 1,400 hours during 2014, 2,600 hours in 2015, 2,300 hours in 2016, and 1,260 hours in 2017. Required: Determine the amount of depreciation expense for the years ended December 31, 2014, 2015, 2016, and 2017, by (a) the straight-line method, (b) units-of-output method, and (c) the double-declining-balance method.