Equipment with a cost of $781,000 has an estimated residual value of $71,000, has an estimated useful life of 25 years, and is depreciated by the straight-iint method. a. Determine the amount of the annual depreciation. b. Determine the book value after 10 full years of use. c. Assuming that at the start of the year 11 the remaining life is estimated to be 18 years and the residual value is estimated to be $72,200, determine the degreciation expense for each of the remaining 18 years