In 2018, FedEx had total assets of $52.9 billion, an asset turnover ratio of 1.65 times, and a net profit margin of 13.5%. a. What is FedEx's return on assets? b. Find FedEx's ROE, given that 42.9% of the assets are financed with stockholders' equity. a. FedEx's return on assets (ROA) is %. (Round to two decimal places.) b. Given that 42.9% of the assets are financed with stockholders' equity, FedEx's return on equity (ROE) is %. (Round to two decimal places.)