Riole Inc. uses a calendar year for financial reporting. The company is authorized to issue 8, 610,000 shares of $10 par common stock. At no time has Oriole issued any potentially dilutive securities. Listed below is a summary of Oriole's common stock activities. 1. Number of common shares issued and outstanding at December 31, 2015 2. Shares issued as a result of a 10% stock dividend on September 30, 2016 3. Shares issued for cash on March 31, 2017 Number of common shares issued and outstanding at December 31, 2017 4. A 2-for-1 stock split of Oriole's common stock took place on March 31, 2018 Compute the weighted-average number of common shares used in computing earnings per common share for 2016 on the 2017 comparative income statement. shares Compute the weighted-average number of common shares used in computing earnings per common share for 2017 on the 2017 comparative income statement. shares