You are evaluating a company's financial statements and see on the income statement that over the last year the company had $439 million in operating income, $74 million in interest expense, and paid $57 million in taxes. Looking at the balance sheet you see that the company had $701 million in long term debt, $918 million in shareholders' equity, and $3.4 billion in total assets. What was the company's return on assets? (Enter your answer as a percent, e.g., if the answer is 5.3% enter 5.3, not 0.053)