Equipment with a cost of $599,400 has an estimated residual waive of $59,400, has an estimated useful life of 20 years, and is depreciated by the straight-line method. Ravision of depreciation a. Determine the amount of the annual depreciation. b. Determine the book value atter 8 full years of use. c. Assuming that at the start of the year 9 the remaining life is estimated to be 15 years and the fesidual value is estimated to be 565,400 , determine the diepreciari7a expense for each of the remaining 15 years