An investor has $800,000 in her account. She borrows $200,000 of funds at the risk-free rate and invests in AAPL. The expected return of AAPL is 16% with return volatility of 32\% and the risk-free rate is 2%. What is the standard deviation of the portfolio? 0.55 0.50 0.40 0.45 An investor has $800,000 in her account. She borrows $200,000 of funds at the risk-free rate and invests in AAPL. The expected return of AAPL is 16% with return volatility of 32\% and the risk-free rate is 2%. What is the standard deviation of the portfolio? 0.55 0.50 0.40 0.45