How would I calculate the discount rate for this problem to get the NPV?

Imagine that you have been charged with selecting the optimal set of investment projects to fund from the following list of 6 proposed projects. Expected Cash Flows (in $ millions) Project A B Initial Cost $300 $250 $350 $475 $200 $150 C Year 1 $100 $400 $50 $75 $0 $50 Year 2 $275 $300 $200 $100 $0 $50 Year 3 $300 $200 $50 $125 $0 $50 Year 4 $200 $100 $200 $150 $500 $50 Year 5 $50 $0 $50 $175 $500 $50 D E F F 1) What is the NPV of Project A? 2) What is the NPV of Project B? 3) What is the NPV of Project C? 4) What is the NPV of Project D? 5) What is the NPV of Project E? 6) What is the NPV of Project F? Imagine that you have been charged with selecting the optimal set of investment projects to fund from the following list of 6 proposed projects. Expected Cash Flows (in $ millions) Project A B Initial Cost $300 $250 $350 $475 $200 $150 C Year 1 $100 $400 $50 $75 $0 $50 Year 2 $275 $300 $200 $100 $0 $50 Year 3 $300 $200 $50 $125 $0 $50 Year 4 $200 $100 $200 $150 $500 $50 Year 5 $50 $0 $50 $175 $500 $50 D E F F 1) What is the NPV of Project A? 2) What is the NPV of Project B? 3) What is the NPV of Project C? 4) What is the NPV of Project D? 5) What is the NPV of Project E? 6) What is the NPV of Project F