how would you do this problem in excel?

Consider the following cash flows: a. What is the profitability index for the above set of cash flows if the relevant discount rate is 10 percent? (Do not round intermediate calculations and round your answer to 3 decimal places, e.g., 32.161.) b. What is the profitability index if the discount rate is 15 percent? (Do not round intermediate calculations and round your answer to 3 decimal places, e.g., 32.161.) c. What is the profitability index if the discount rate is 22 percent? (Do not round intermediate calculations and round your answer to 3 decimal places, e.g., 32.161.)