An investor is considering two securities:o Security A: expected returns, $12\%,$ SD $=5\%,$o Security B: expected returns $=18\%,$ SD $=9\%,$CovA, B$)=0\mathrm{.}3$Risk$-$free security: Returns $=6\%.$What is the expected return and volatility of a portfolio with $60\%$ in A and the remainder in B$?$What combination of the risk$-$free and security A will yield the returns of Security B$?$ What is the volatility of this portfolio?