For the year ended September 27, 2014, Apple, Inc., reported net income of $39,510 million. Total shareholders' equity on this date was $111,547 million, and on September 28, 2013, it was $123,549 million. No preferred stock was outstanding in either year.

Required

1. Compute Apple's return on common stockholders' equity for the year ended September 27, 2014.

2. What other ratio would you want to compute to decide whether Apple is successfully employing leverage? Explain your answer.