NPV IRR Payback period Discounted Payback Period CFO CF1 CF2 CF3 CF4CFSCF6CF CF8 -1000 300 200 700 400 NPV -237.14 IRR = 19.38% Payback - disc Payback = -2000 500 500 500 500 100 100 200 200 NPV = -100.59 IRR -8.20% -4000 300 800 800 600 1100 1120 500 NPV =483.45 IRR -6.55% 6000 2000 2000 2000 2000 2000 NPV - 1581.57 IRR-19.86% Use 10% as your wacc-the discount rate for your NPV formulation and for your discounted payback period