Consider a retail firm with a net profit margin of 3.42%, a total asset turnover of 1.81 , total assets of $43.2 million, and a book value of equity of $18.2 million. a. What is the firm's current ROE? b. If the firm increased its net profit margin to 4.00%, what would be its ROE? c. If, in addition, the firm increased its revenues by 22% (maintaining this higher profit margin and without changing its assets or liabilities), what would be its ROE