12. Suppose you held a diversified portfolio consisting of 10 different common stocks, investing $500 in each stock. The portfolio's beta is 1.9. Now suppose you decided to sell one of the stocks in your portfolio with a beta of 0.8 for $500 and use the proceeds to buy another stock with a beta of 1.25. What would your portfolio's new beta be? * O a) 3.865 b) 1.074 O c) 2.025 d) 4.2 O e) None of the above 13. Your brother is about to retire, and he wants to buy an annuity that will for 25 years with the first