You decide to open a margin account with your broker. You deposit $20,000 in your account. In addition, you borrow $20,000 from your broker and purchase 400 shares of XYZ corporation at $100 per share. As soon as you buy the stock, it drops to $90 per share.

3A) What is your margin rate after the stock price drop to $90 per share?

3B) If the stock drops further to $80 per share, how much money will you need to deposit in your account to bring the margin rate up to 40%?