Revision of Depreciation Equipment with a cost of $585,800 has an estimated residual value of $67,400, has an estimated useful life of 27 years, and is depreciated by the straight-line method a. Determine the amount of the annual depreciation. 24,300 X b. Determine the book value after 13 full years of use. 355,300 X c. Assuming that at the start of the year 14 the remaining life is estimated to be 20 years and the residual value is estimated to be $68,200, determine the depreciation expense for each of the remaining 20 years. 15,300 X