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A diversified portfolio of risky securities has an expected return of 15% and standard deviation of 20%. The risk-free rate is 4%. Suppose Bob has $200 to invest and can borrow and lend at the risk-free rate. What is the expected return of Bob's portfolio if he borrows $100 at the risk-free rate and invests $300 in the risky portfolio? 0 12.67% O24.50% 15.00% 20.50%