Revision of Depreciation Equipment with a cost of $519,800 has an estimsted residuat value of $59,800, has an estimated useful life of 25 years, and is depredated by the straght.ine methos. a. Determine the amount of the annual depreciation. b. Determine the book value at the end of the 10 full vears of use. c. Assuming that at the start of the year 11 the remaining life is estimated to be 23 years and the residual value is estimated to be $55,200, determice the deprecation expense for each of the remaining 23 years