The following data has been collected about a company's stockholders' equity accounts: Common stock $10 par value 30,000 shares authorized and 15,000 shares issued $150,000 Contributed capital in excess of par value, common stock 75,000 Retained earnings 37,500 Treasury stock, 3,000 shares 17,750 The treasury shares were all purchased at the same price. The cost per share of the treasury stock is: a)$11.33 b)$5.92 c)$8.42 d)$11.83 e)$4.42