Suppose that many stocks are traded in the market and that it is possible to borrow at the risk-free rate, r. The characteristics of two of the stocks are as follows Expected Return Standard Deviation 12% 21 % 40% 60% Correlation1 a. Calculate the expected rate of return on this risk-free portfolio? (Hint: Can a particular stock portfolio be substituted for the risk-free asset?) (Round your answer to 2 decimal places.) Rate of retum b. Could the equilibrium rf be greater than 15.60%? Yes