Equipment with a cost of $799,400 has an estimated residual value of $92,000, has an estimated useful life of 27 years, and is depreciated by the straight-line miethod. a. Determine the amount of the annual depreciation. b. Determine the book value after 15 full years of use. c. Assuming that at the start of the year 16 the remaining life is estimated to be 17 years and the residual value is estimated to be 580,000 , determine the depreciation expense for each of the remaining 17 years