You had a margin account with $5,000 equity. Together with the $5,000 you borrowed from your broker, you purchased 100 shares of IBM stocks at $100 per share. One year later (today), the IBM stock price falls to $60 per share. Assume margin interest rate is 9% per year. What is the current margin of your account?
A. 83.33%
B. 55.05%
C. 25.67%
D. 9.17%