Which of the following statements is (are) correct?

If two firms pay the same interest rate on their debt and have the same rate of return on assets, and if that ROA is positive, the firm with the higher debt ratio will also have a higher rate of return on common equity

One of the problems of ratio analysis is that the relationships are subject to manipulation. For example, we know that if we use some of our cash to pay off some of our current liabilities, the current ratio will always increase, especially if the current ratio is weak initially

Generally, firms with high-profit margins have high asset turnover ratios, and firms with low-profit margins have low turnover ratios; this result is exactly as predicted by the Du Pont equation

All of the above are correct