Problems 1. A stock has a required return of 12%. The risk-free rate is 6% and the market risk premium is 5%. What is the stock's beta coefficient? 2. A stock has a required return of 12%. The risk-free rate is 4% and the market risk premium is 5%. If the market risk premium increases to 8%, what is the stock's new required return? Assume the risk-free rate and the beta remain unchanged. 3. Jan owns a 3-stock portfolio with a total investment of $300,000. What is the weighted average beta of Jan's portfolio