Oprian Company uses straight line depreciation for a machine costing $47,300. When it was purchased, the company estimated that it would have a useful life of 7 years and a salvage value of $5,000. At the start of the fourth year, the company has revised its estimates. The machine will last an additional 5 years and the salvage value will be only $4,000. Compute the machine's book value at the end of its third year and the amount of depreciation for each of the final five years given the revised estimates.