You are bearish on AT&T stocks and decide to sell short 100 shares at the current market price of $15 per share. The initial margin requirement is 50% and the maintenance margin requirement is 30%.
a. How high can the price of the stock go before you get a margin call?
b. If you earn no interest on the funds in your margin account, what will be the rate of return after one year if AT&T stock is selling at (i) $20 and (ii) $12.50?