With given information Shares Price Volatity Beta Expected Return A 10000 50 8% 20% 65% B 5000 100 18% 40% 115% The correlation between Sa and SB returns is 0.5. The expected return rate of the market is 12%, the market return volatility is 30%, and the risk-free rate is 2%. Returns of all risky assets follow normal distributions. What is the expected return rate of the portfolio? What is the variance of its return