Required information [The following information applies to the questions displayed below.] The stockholders' equity section of Velcro World is presented here. VELCRO WORLD Balance Sheet (partial) Stockholders' equity: ($ and shares in thousands) Preferred stock, $1 par value Common stock, $1 par value Additional paid-in capital Total paid-in capital Retained earnings Treasury stock, 11,000 common shares Total stockholders' equity 5,100 21,000 624,000 650,100 279,000 (253,000) $ 676,100 Based on the stockholders' equity section of Velcro World, answer the following questions. Remember that all amounts are presented in thousands. Required: 1. How many shares of preferred stock have been issued? (Enter you answer in total number of shares, not in thousands.) Number of shares