depreciation by 2 methods: partial years Knife edge company purchased tool sharpening equipment on jul 1 2010 for 16,200. The equipment was expected to have a useful life of 3 yrs and a residual value of 900.00. --Determine the amount of depreciation expense for the years ended dec 31, 2010,2011,2012, 2013. --Use straight line method and double declining method