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