Assume that you manage a risky portfolio with an expected rate of return of 17% and a standard deviation of 36%. The T-bill rate is 4.5% A client prefers to invest in your portfolio a proportion () that maximizes the expected return on the overall portfolio subject to the constraint that the overall portfolio's standard deviation will not exceed 25% a. What is the investment proportion, ? (Do not round intermediate calculations. Round your answer to 2 decimal places.) Investment proportion y %6 b. What is the expected rate of return on the overall portfolio? (Do not round Intermediate calculations. Round your answer to 2 decimal places.) Rate of retum