8 Suppose you hold a diversified portfolio consisting of a $7500 investment in each of 20 different ordinary shares. The portfolio beta is equal to 1.12. You have decided to sell one of the shares in your portfolio with a beta equal to 1.0 for $7500 and to use the proceeds to buy another share for your portfolio. Assume that the new share's beta is equal to 1.75. Calculate your portfolio's new beta