Your portfolio consists of $62,276 invested in a stock that has a beta =1.2, $23,528 invested in a stock that has a beta =0.9, and $20,786 invested in a stock that has a beta =0.9. The risk-free rate is 3.4%. Last year this portfolio had a required return of 8.2%. This year nothing has changed except that the market risk premium has increased by 4.2%. What is the portfolio's current required rate of retum? 12.22% 11.72X 12.72% 13.72% 13.22x