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) ($ and shares in thousands) Stockholders' equity! Preferred stock, $1 par value $ 4,500 Common stock, $1 par value 15,000 Additional paid-in capital 363,000 Total paid-in capital 382.500 Retained earnings 273,000 Treasury stock, 10,000 common sharen (170,000) Total stockholdera' equity $ 485,500 Based on the stockholders' equity section of Velero 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