4. Suppose that you sell short 500 shares of Intel, currently selling for $40 per share, and give your broker $15,000 to establish your margin account. a. If you carn no interest on the funds in your margin account, what will be your rate of return after 1 year if Intel stock is selling at: (i) $44; (ii) $40; (iii) 836? Assume that Intel pays no dividends. b. If the maintenance margin is 25%, how high can Intel's price rise before you get a margin call? c. Redo parts (a) and (b), but now assume that Intel also has paid a year-end dividend of S1 per share. The prices in part (a) should be interpreted as ex-dividend, that is, prices after the dividend has been paid