Vaughn Corporation had net income of $210000 and paid dividends of $36000 to common stockholders and $11000 to prefer stockholders in 2021. Vaughn Corporation's common stockholders' equity at the beginning and end of 2021 was $920000 and $1080000, respectively. There are 113000 weighted-average shares of common stock outstanding. Vaughn Corporation's return on common stockholders' equity was