I got 11.84 but a classmate got 11.42. So we don't know who is correct, can someone help?

Exercise #6: Portfolio beta. The risk-free rate is 4%; the expected return on the market is 11%. Stock A has a beta of 0.7; Stock B has a beta of 1.0. Stock C has a beta of 1.6. Compute the expected return on a portfolio with 40% in A, 20% in B, and 40% in B