Perdue Company purchased equipment on April $1$ for $$50,190.$ The equipment was expected to have a useful life of three years, or $6,900$ operating hours, and a residual value of $$1,890.$ The equipment was used for $1,200$ hours during Year $1,2,400$ hours in Year $2,2,100$ hours in Year $3,$ and $1,200$ hours in Year $4.$

Required:

Determine the amount of depreciation expense for the years ended December $31,$ Year $1,$ Year $2,$ Year $3,$ and Year $4,$ by $($a$)$ the straight$-$line method, $($b$)$ the units$-$of$-$activity method, and $($c$)$ the double$-$declining$-$balance method. Note: Round all final values for each depreciation method and each year to the nearest whole dollar.

a$.$ Straight$-$line method

Year Amount

Year $1$

Year $2$

Year $3$

Year $4$

b$.$ Units$-$of$-$activity method

Year Amount

Year $1$

Year $2$

Year $3$

Year $4$

c$.$ Double$-$declining$-$balance method

Year Amount

Year $1$

Year $2$

Year $3$

Year $4$