You are evaluating a project that has the following cash flows: -100 today, then cash inflows of 20, 30, and 40 for the next three years, respectively, and thereafter cash flows grow at 5% per year forever. (E.g. the cash flow at time 4 is 5% greater than 40 or 42).
a. What is the NPV if the discount rate is 15%?
b. What is the IRR (show to at least one decimal place)?