Depreciation: Straight$-$line and double$-$declining$-$balance

Knife Edge Company purchased tool sharpening equipment on January $1,20$Y$5,$ for $$16,200.$The equipment was expected to have a useful life of $4$ years and a residual value of $$900.$

Instructions:

a$.$ Determine the amount of depreciation expense for the years ended December $31,20$Y$5,20$Y$6,20Y7$ and $20Y8$ by the straight$-$line method.

b$.$ Determine the amount of depreciation expense for the years ended December $31,20$Y$5,20$Y$6,20$Y$7$ and $20$Y$8$ by the double$-$declining$-$balance method. Round the double$-$declining$-$balance depreciation rate to six decimal places and round your final answers to the nearest whole dollar.