Selected financial data for Irvington Company appear below:
Account Balances
Beginning of year End of year
Preferred stock $125,000 $125,000
Common stock 300,000 400,000
Retained earnings 75,000 185,000
During the year, the company paid dividends of $10,000 on its preferred stock. The company's net income for the year was $120,000. what is the company's return on common stockholders' equity for the year ?