Please show all steps, Do not use Excel without also showing me the steps to understand. Thanks!) Security A has a beta of 1.23 and an expected return of 11.7%, Security B is risk. free and currently earns 3.5%. a. What is the expected return on a portfolio that is equally invested in the two securities? b. If a portfolio of the two securities has a beta of D.7, what are the portfolio weights? C. If a portfolio of the two securities has an expected return of 9%, what is its beta?