Depreciation by three methods; partial years

Perdue Company purchased equipment on April $1$ for $$33,480.$ The equipment was expected to have a useful life of $3$ years, or $5,400$ operating hours, and a residual value of $$1,080.$ The equipment was used for $1,000$ hours during Year $1,1,900$ hours in Year $2,1,600$ hours in Year $3,$ and $900$ 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: FOR DECLINING BALANCE ONLY, round the final multiplier to four decimal places. Then, round the answer for each year to the nearest whole dollar.

a$.$ Straight$-$line method

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

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