an investor has a portfolio worth 12.3 million dollars, made up of ten different types of securities. the beta of the portfolio is 3.8. the investor sold security A whose beta is 1.25 for 4 million dollars. he then invested the full amount of the sale in security C whose beta is 1.6. interest rate on treasury bills is 8 percent and market rate is 11 percent.

1.compute the required rate or return of the new portfolio

2. two months later, the investor invested additional 2.7 million dollars in the portfolio by including security D. compute the beta of security D, assuming the required rate of return on the portfolio is now 18.143 percent.