For the year ended September 26, 2015, Casper corporation reported net income of $2,240 million. Total shareholders equity on this date was $18,778 million , and on September 27, 2014, it was $19,673 million. No preferred stock was outstanding in either year.

1. Compute Caspars return on common stockholders equity for the year ended September 26, 2015. Round your answer to two decimal places