In 2018. FedEx had total assets of $51.3 billion, an asset turnover ratio of 1.88 times, and a net profit margin of 8.1% a. What is FedEx's return on assets? b. Find FedEx's ROE, given that 43.2% of the assets are financed with stockholders' equity a. FedEx's return on assets (ROA) is % (Round to two decimal places.) b. Given that 43.2% of the assets are financed with stockholders' equity, FedEx's return on equity (ROE) is % (Round to two decimal places.)