Revision of Depreciation Equipment with a cost of $714,300 has an estimated residual value of $70,800, has an estimated useful life of 15 years, and is depreciated by the straight-line method. a. Determine the amount of the annual depreciation. $ b. Determine the book value after 8 full years of use. $ c. Assuming that at the start of the year 9 the remaining life is estimated to be 13 years and the residual value is estimated to be $74,700, determine the depreciation expense for each of the remaining 13 years. SA