Equipment with a cost of $704,000 has an estimated residual value of $81,000, has an estimated useful life of 35 years, and is depreciated by the straight-line method.

a. Determine the amount of the annual depreciation. $fill in the blank 1

b. Determine the book value after 17 full years of use. $fill in the blank 2

c. Assuming that at the start of the year 18 the remaining life is estimated to be 21 years and the residual value is estimated to be $71,700, determine the depreciation expense for each of the remaining 21 years. $fill in the blank 3