Risk and return

An investor invests 30% funds in risk free asset, 70% in index fund. Risk free return is 8%,index return is 21%, index standard deviation is 9.80… A) What is the standard deviation of portfolio? B) If he borrows 20% risk free asset and invest the same in index fund what is the portfolio risk n return?

Really?

Ohai why be so aggro for no reason dude?

is there a CFA level zero forum?