Problem 6-17 You manage a risky portfolio with an expected rate of return of 21% and a standard deviation of 31%. The T-bill rate is 5% Your risky portfolio includes the following investments in the given proportions: Stock A Stock B Stock 25% 36% Suppose that your client decides to invest in your portfolio a proportion yof the total investment budget so that the overall portfolio will have an expected rate of return of 17% a. What is the proportion y? (Round your answer to the nearest whole number.) Proportion y b. What are your client's investment proportions in your three stocks and the T-bill fund? (Do not round intermediate calculations. Round your answers to 2 decimal place.) Investment Proportions T-Bills Stock A Stock B Stock C c. What is the standard deviation of the rate of return on your client's portfolio? (Do not round Intermediate calculations. Round your answer to 2 decimal place.) Standard deviation %