An asset was purchased for $$63,000$ and originally estimated to have a useful life of $10$ years with a residual value of $$3,700.$ After $2$ years of straight$-$line depreciation, it was determined that the remaining useful life of the asset was only $2$ years with a residual value of $$1,480.$

a$.$ Determine the amount of the annual depreciation for the first $2$ years.

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b$.$ Determine the book value at the end of Year $2.$

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c$.$ Determine the depreciation expense for each of the remaining years after revision.

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