Assume you sell short 100 shares of common stock at $70 per share, with initial margin at 55%. The minimum margin requirement is 30%. The stock will pay no dividends during the period, and you will not remove any money from the account before making the offsetting transaction.

At what price would you face a margin call?

If the price is $86 at the end of the period, what is your margin at that point?

What would be your profit if you repurchase the stock at $63/share?