Knife Edge Company_Depreciation methods

Knife Edge Company purchased tool sharpening equipment on July 1, 2010, for $16,200.  The equipment was expected to have a useful life of three years and a residual value of $900.

Instructions: determine the amount of depreciation expense for the years ended December 31, 2010, 2011, 2012, 2013 by (a) the straight-line method and (b) the double declining-balance method.