What is the IRR of the following set of cash flows? Year WN-o Cash Flow -$10,393 6,500 3,200 5,700 Year Cash Flow -$7,700 3,800 4,100 3,600 a. What is the profitability index for the cash flows if the relevant discount rate is 8 percent? b. What is the profitability index for the cash flows if the relevant discount rate is 16 percent