Elmwood Excavation Consultants began the current year with 30,000 common shares outstanding. It issued additional shares of 15,000 and 18,000 on March 1 and August 1, respectively. The company also purchased 3,000 shares of treasury stock on November 1. The firm's year end is December 31. Based on this information, determine the weighted average number of common shares outstanding for the year. (Enter a decrease in shares outstanding with a minus sign or parentheses.) ... Number of Shares Outstanding Weight by Number of Months Shares Are Outstanding Weighted-Average Shares Outstanding Date Event 1/1 Balance 3/1 New Issue 8/1 New Issue 11/1 Treasury Stock Purchase 12/31 Balance