You are evaluating a company's financial statements and see on the income statement that over the last year the company had $438 million in operating income, $35 million in interest expense, and paid $39 million in taxes. Looking at the balance sheet you see that the company had $618 million in long term debt, $932 million in shareholders' equity, and $3.6 billion in total assets. What was the company's return on capital? (Enter your answer as a percent, e.g., if the answer is 5.3% enter 5.3, not 0.053)