A truck with a cost of \(\$ 90,000\) has an estimated residual value of \(\$ 15,000\), has an estimated useful life of eight years, and is depreciated by the straight-line method.

(a) Determine the amount of the annual depreciation.

(b) Determine the book value at the end of the fourth year of use.

(c) Assuming that at the start of the fifth year the remaining life is estimated to be five years and the residual value is estimated to be \(\$ 12,500\), determine the depreciation expense for each of the remaining five years.objs. 4,5