Revision of Depreciation A warehouse with a cost of $627,200 has an estimated residual value of $67,200, has an estimated useful life of 20 years, and is depreciated by the straight-line method. a. Determine the amount of the annual depreciation. b. Determine the book value after 7 full years of use. c. Assuming that at the start of year 8 the remaining life is estimated to be 16 years and the residual value is estimated to be $64,800, determine the depreciation expense for each of the remaining 16 years