Question 17 What is the most expensive form of financing and why? Question 18 Which is the most accurate measure we can use to evaluate a project? NPV, IRR or Payback period. Which is the easiest to calculate without a computer? Question 19 Calculate the payback period for projects X and Y. They both cost $100,000 (show your work) Year 0 1 2 3 4 5 6 Project X $20m 30m 40m 20m 10m 10m Project Y $40m 30m 30m 20m 10m 0