Suppose that XTel currently is selling at $50 per share. You buy 700 shares using $28,000 of your own money, borrowing the remainder of the purchase price from your broker. The rate on the margin loan is 9%. Required: a. What is the percentage increase in the net worth of your brokerage account if the price of XTel immediately changes to (i) $56; (ii) $50; (ii) $44? (Leave no cells blank - be certain to enter "0" wherever required. Negative values should be indicated by a minus sign. Round your answers to 2 decimal places.) b. If the maintenance margin is 20%, how low can XTels price fall before you get a