The asset was purchased for 61000 and originally estimated to have use life of 10 years with a residual value of $4300. After two years of straight line depreciation, it was determined that the remains useful life was only 2 years w/ residual value of $1720. Determine a: annual depreciation for 2 years b: the book value at the end of two years c: depreciation expense for each of the remaining years after revision