i need answers for D and E

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 7%. 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; (i) $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.) Answer is complete and correct. b. If the maintenance margin is 20%, how low can XTel's price fall before you get a margin call? (Round your answer to 2 decimal places.) c. How would your answer to requirement b would change if you had financed the initial purchase with only $17,500 of your own money? (Round your answer to 2 decimal places.) Answer is complete and correct. Price d. What is the rate of return on your margined position (assuming again that you invest $28,000 of your own money) if XTel is selling after one year at (i) $56; (ii) $50; (iii) $44 ? (Negative values should be indicated by a minus sign. Round your answers to 2 decimal places.) e. Continue to assume that a year has passed. How low can XTel's price fall before you get a margin call? Note: Assume maintenance margin of 20% (Round your answer to 2 decimal places.)