Discrete cash flows are anticipated to have the following functional form: f(t) = $100, t = 2, 3, 4; f(t) = $200, t = 8, 9, 10; f(t) = $0, otherwise.

a.) Using z-transformations, compute the present worth based on an annual compound interest rate of 8%.

b.) Using Excel and the NPV worksheet function, computer the present worth based on an annual compound interest rate of 8%.