Depreciation by three methods; partial years

Layton Company purchased tool sharpening equipment on October $1$ for $$38,880.$ The equipment was expected to have a useful life of $3$ years or $3,780$ operating hours, and a residual value of $$1,080.$ The equipment was used for $700$ hours during Year $1,1,300$ hours in Year $2,1,100$ hours in Year $3,$ and $680$ 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 multiplier to four decimal places. Then round the answer for each year to the nearest whole dollar.

a$.$ Straight$-$line method

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