Suppose you invest $4,000 today and recelve $9,750 in 20 years. a. What is the internal rate of return (IRR) of this opportunity? b. Suppose another investment opportunity also requires $4,000 upfront, but pays an equal amount at the end of each year for the next 20 years, If this investment has the same IRR as the first one, what is the amount you will receive each year