Consider a retail firm with a net profit margin of 3.74%, a total asset turnover of 1.74, total assets of $42.2 million, and a book value of equity of $185 million a. What is the firm's current ROE? b. If the firm increased its net profit margin to 4.46%, what would be its ROE? c. If in additional the firm increased its revenues by 20% (maintaining this higher profit margin and without changing its assets or liabilities), what would be its ROE