Problem 4-02 You purchase 80 shares for $30 a share ($2,400), and after a year the price falls to $25. 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. 25 percent. Use a minus sign to enter the amount as a negative value. Round your answer to one decimal place. % b. 65 percent. Use a minus sign to enter the amount as a negative value. Round your answer to one decimal place. % C. 75 percent. Use a minus sign to enter the amount as a negative value. Round your answer to one decimal place. %