Etzkorn Corporation's year-end assets are $1,650, its sales for the year are $2,730, its operating costs are $2,438, its interest charges are $52, and its tax rate is 40%. Its total current liabilities are $300 consisting of $225 of accruals and $75 of notes payable. Its long-term debt is $450. Etzkorn uses only debt and common equity in its capital structure. Using the DuPont equation, what is Etzkorn's ROE rounded to the nearest whole percentage? a. 13% b. 16% c. 14% d. 15% e. 17%

Please also explain how the common equity is figured out.