Old Economy Traders opened an account to short-sell 1,000 shares of Internet Dreams at $40 per Share. The initial margin requirement was 50%. (The margin account pays no interest.) A year later, the price of Internet Dreams has risen from $40 to $50, and the stock has paid a dividend of $2 per share.

a. What is the remaining margin in the account?

b. If the maintenance margin requirement is 30%, will Old Economy receive a margin call?

c. What is the rate of return on the short position (treating the initial margin as the amount invested)?