A firm has a profit margin of 15 percent on sales of $20,000,000. If the firm has a debt of $7,500,000, total assets of $22.500.000, and an interest cost on a total debt of 5 percent, what is the firm's return on total assets (ROA)? (Round anstver to two decimal places.) a) 13.33% b) 15.18% c) 8.479 d) 2020 e) 10.94