c. What range of portfolio weights produce inefficient portfolios? d. Now, suppose you can save/borrow at the risk-free rate of 3%. What is the expected return and volatility of the tangent portfolio, and what are its portfolio weights? Expected Return Company A Company B 10% 15% Covariance matrix A B 0.0144 0.0066 A B 0.0066 0.0484 c. What range of portfolio weights produce inefficient portfolios? d. Now, suppose you can save/borrow at the risk-free rate of 3%. What is the expected return and volatility of the tangent portfolio, and what are its portfolio weights? Expected Return Company A Company B 10% 15% Covariance matrix A B 0.0144 0.0066 A B 0.0066 0.0484