If a firm's profit margin increases by 8%, the debt-to-equity ratio increases from 35% to 55%, and asset turnover falls by 20%, the effect on ROE is ______.

A. +1.6%

B . +0.24%

C . -0.8%

If a firm's profit margin increases by 8%, the debt-to-equity ratio increases from 35% to 55%, and asset turnover falls by 20%, the effect on ROE is ______.

A. +1.6%

B . +0.24%

C . -0.8%

Which of the following financial ratios is NOT used in determining a company's return on equity with the extended DuPont model?

A. Total asset turnover

B . Total debt ratio

C . Operating profit margin

D . Interest expense rate