Please help on this question.

Assume that you manage a risky portfolio with an expected rate of return of 17% and a standard deviation of 27%. The T-bill rate is 7%. Your risky portfolio includes the following investments in the given proportions: Your client decides to invest in your risky portfolio a proportion (y) of his total investment budget with the remainder in a T-bill money market fund so that his overall portfolio will have an expected rate of return of 15%. a. What is the proportion y ? (Round your answer to 1 decimal place.) Proportion y b. What are your client's investment proportions in your three stocks and the T-bill fund? (Round your answers to 1 decimal place.) c. What is the standard deviation of the rate of return on your client's portfolio? (Round your answer to 1 decimal place.) Standard deviation \% per year