Stock X, Stock Y, and the market have had the following returns over the past four years. Year Market X Y 1 10% 12% 8% 2 9 6 3 3 14 10 12 4 5 4 -2 8 The risk-free rate is 3 percent. The market risk premium is 7 percent. What is the required rate of return for a portfolio which consists of $15,000 invested in Stock X and $10,000 invested in Stock Y? 11.76% 7.31% 10.55% 11.58% 8.00%