What is the excel formula to calculate the NPV values with cell references?

Now conduct a scenario analysis. Assume that there is a 25% probability that best-case conditions, with each of the variables discussed in Part b being 20% better than its base-case value, will occur. There is a 25% probability of worst-case conditions, with the variables 20% worse than base, and a 50% probability of base case conditions. d. If the project appears to be more or less risky than an average project, find its risk-adjusted NPB, IRR, and payback