Tammy has a portfolio comprised of 10 percent stock A, 60 percent stock B, and 30 percent stock C. The expected returns on stocks A, B and C are 12.7%, 13.05%, and 10.7%, respectively. What is her portfolio's expected rate of return? 1) 10.46% 2) 11.88% 3) 11.97% 4) 12.31%