please post excel work if possible thank u

Consider the following projects: a. If the opportunity cost of capital is 12%, which project(s) have a positive NPV? b. Calculate the payback period for each project. c. Which project(s) would a firm using the payback rule accept if the cutoff period is three years? d. Calculate the discounted payback period for each project. e. Which project(s) would a firm using the discounted payback rule accept if the cutoff period is three years