You hold a portfolio of three stocks with the following investments and individual betas. Stock A $20,000 investment has a beta of 1.50. Stock B $30,000 investment has a beta of 0.80. Stock C $15,000 investment has a beta of 0.25. a) (4 points) What is the portfolio beta? Show all work. b) (5 points) If the current risk-free rate of return is 2.75% and the return on an average risk security, r(m), is 9%, what is the required rate of return on the portfolio? Show all work