Year WN - O Cash Flow -$ 8,900 4,100 3,500 5,100 a. What is the profitability index for the cash flows if the relevant discount rate is 7 percent? Profitability index b. What is the profitability index for the cash flows if the relevant discount rate is 15 percent? Profitability index c. What is the profitability index for the cash flows if the relevant discount rate is 27 percent? Profitability index