Assume you sell short 100 shares of common stock at $45 per share, with an initial margin of 50%. Assume further that the interest rate on the margin is 6% APR. The stock paid no dividends during the period, and you did not remove any money from the account before making the offsetting transaction. What would be your annualized rate of return if you repurchase the stock at $40 per share in six months? (Use two decimal places)