In 2018 , FedEx had total assets of $52.3 billion, an asset turnover ratio of 1.25 times, and a net profit margin of 7.0%. a. What is FedEx's return on assets? b. Find FedEx's ROE, given that 37.1% of the assets are financed with stockholders' equity. a. FedEx's return on assets (ROA) is \%. (Round to two decimal places.) b. Given that 37.1% of the assets are financed with stockholders' equity, FedEx's return on equity (ROE) is (Round to two decimal places.)