Assume the yield curve is flat and the T-bill rate is 5%. The market return rate is 10%. The required rate of return for Stock A is 11.3%. An investor is forming a portfolio by investing $50,000 in stock A and $25,000 in stock B. Stock B has a beta of 0.6. What is the required rate of return on the investor's portfolio? Stock TRF IM Beta Weight Required return 11.3% A B Select one: a. 10.7% b. 11.2% c. 6.8% d. 9.0% e. 10.20%