I am struggling to get to the answers. The answer to part a is -8.73M and the answer to part b is 14.33M. I think I may have part a but I completely don't get part b. can you provide step by step for each?

You are given the following information on the best guess of related outcomes for a project. The initial cash outlay for developing and market testing the product over the next year IS $70M.Following the test, the company will spend another $400M to put the productive capabilities in place at the END of the year.If the test is successful, which is expected to have a probability of 0.8, the expected annual cash flows will be $150M for five years.If the test fails, the expected annual cash flows will be $50M for five years.The discount rate is 12%.

(a)Compute the NPV of this project at time 0 assuming that the project will be implemented regardless of the outcome of the test.Given that the value at the END of the testing year of the 5-year $150M annuity is $540.72M, and that of the 5-year $50M annuity is $180.24M.<$-8.73M>

(b)Say, you are given the option to upgrade by building a better production facility at a cost of $500M if the test fails.The upgraded facility is expected to generate annual cash flows of $100M for five years.Note that the base facility and cash flows estimates will apply if the test is successful.Compute the value of the option to upgrade at time 0. <$14.33M