Equipment with a cost of $423,100 has an estimated residual value of $48,700, has an estimated useful life of 32 years, and is depreciated by the straight-line method.

a. Determine the amount of the annual depreciation. $

b. Determine the book value after 19 full years of use. $

c. Assuming that at the start of the year 20 the remaining life is estimated to be 20 years and the residual value is estimated to be $40,800, determine the depreciation expense for each of the remaining 20 years. $