Vent, Inc. reported netincome of $770,000 for 2015. Vent sold 15,000 shares of treasury stock acqured in a previous year on July 1 and 15,000 new shares on November 1. At year end, 180,000 shares were outstanding. Vent had 20,000 shares of $100 par value 7% preferred stock outstanding all year. Vent paid dividends to the preferred shareholdres. What is the weighted average number of common shares used to compute earnings per share for 2015?