You purchase 160 shares for $50 a share ($8,000), and after a year the price rises to $60. 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. Round your answer to one decimal place. % b. 35 percent. Round your answer to one decimal place. % c. 75 percent. Round your answer to one decimal place. % ((