*please explain how to do problem*

Assume that you manage a risky portfolio with an expected rate of return of 13% and a standard deviation of 37%. The T-bill rate is 4%. Your client chooses to invest 75% of a portfolio in your fund and 25% in a T-bill money market fund.

a.	What is the expected return and standard deviation of your client's portfolio? (Round your answers to 2 decimal places.)

Expected return	% per year
Standard deviation	% per year

b.	Suppose your risky portfolio includes the following investments in the given proportions:

Stock A	21%
Stock B	30%
Stock C	49%

What are the investment proportions of your client