a. What is the profitability index for the set of cash flows if the relevant discount rate is 9 percent? (Do not round intermediate calculations and round your answer to 3 decimal places, e.g., 32.161.) b. What is the profitability index for the set of cash flows if the relevant discount rate is 14 percent? (Do not round intermediate calculations and round your answer to 3 decimal places, e.g., 32.161.) c. What is the profitability index for the set of cash flows if the relevant discount rate is 21 percent? (Do not round intermediate calculations and round your answer to 3 decimal places, e.g., 32.161.)