(Problem 7.12) Assume that cost to proceed, initial monthly sales, and the monthly gradient can vary

(Problem 7.12) Assume that cost to proceed, initial monthly sales, and the monthly gradient can vary 20% to the good and 30% to the bad. Create bad, most likely, and good scenarios, and find the IRR for each. (Answer: im = 8.2%, 15.23%, 21.45%)