6. In a margin trade, you bought a total of 1000 shares of XYZ common stock at $20 per share. Assume the initial margin is 50% and the interest rate on the margin loan is 10%. If the stock price turns out to be $25 at the end of the year, how much profit did you make on your investment? (XYZ didn't pay any dividends.) A) 25% B) 40% C) 50% D) 80% E) 90%