Suppose that many stocks are traded in the market and that it is possible to borrow at the risk-free rate, rf. The characteristics 0 two of the stocks are as follows: Required: a. Calculate the expected rate of return on this risk-free portfolio? (Hint Can a particular stock portfolio be formed to create a "synthetic" risk-free asset?) (Round your answer to 2 decimal places.) b. Could the equilibrium rf be greater than rate of return