Consider a retail firm with a net profit margin of 3.15%, a total asset turnover of 1.89, total assets of $43.3 million, and a book value of equity of $17.6 million a. What is the firm's current ROE? b. If the firm increased its net profit margin to 4.10%, what would be its ROE? C. If in addition, the firm increased its revenues by 20% maintaining this higher profit margin and without changing its assets or liabilities what would be its ROE