In 2018, FedEx had total assets of $54.9 billion, an asset turnover ratio of 1.53 times, and a net profit margin of 8.4%. a. What is FedEx's return on assets? b. Find FedEx's ROE, given that 35.4% of the assets are financed with stockholders' equity. a. FedEx's return on assets (ROA) is %. (Round to two decimal places.)