Problem 4-02 You purchase 180 shares for $60 a share ($10,800), and after a year the price falls to $55. Calculate the percentage return on your investment if you bought the stock on margin and the margin requirement was (ignore commissions, dividends, and interest expense): a. 20 percent. Use a minus sign to enter the amount as a negative value. Round your answer to one decimal place. 96 b. 50 percent. Use a minus sign to enter the amount as a negative value. Round your answer to one decimal place. c. 85 percent. Use a minus sign to enter the amount as a negative value. Round your answer to one decimal place.