PR 10-3A Depreciation by three methods; partial years Perdue Company purchased equipment on April 1, 2014, for $270,000. The equipment was expected to have a useful life of three years, or 18,000 operating hours, and a residual value of $9,000. The equipment was used for 7,500 hours during 2014,5,500 hours in 2015,4,000 hours in 2016 , and 1,000 hours in 2017. nstructions Determine the amount of depreciation expense for the years ended December 31, 2014, 2015,2016 , and 2017 , by (a) the straight-line method, (b) the units-of-output method, Ind (c) the double-declining-balance method