NO SPAM! STEP BY STEP calculation by hand! Urgent!

For project A: NPV = 100 * 10^6 by using a discount rate 3%. The NPV was calculated over 30 years. If the project is extended by NEXT 3 more years, it gets these benefits & costs such as: Year 1 5*10^6 Year 2 5*10^6 Year 3 5*10^6 Benefits in s Costs in $ 6*10^6 4*10^6 3*106 Case 1: IRR> 3%. Case 2: project can't be extended Prove by hand-calculation (not excel) if the case 1 & 2 are true or false & which one is true or which one is false & why