ROI analysis using the DuPont model a. Firm A has a margin of 7%, sales of $980,000, and ROI of 19.6%. Calculate the firm's average total assets. b. Firm B has net income of $259,200, turnover of 0.9, and average total assets of $1,800,000. Calculate the firm's sales, margin, and ROI. Round your percentage answer to one decimal place. c. Firm C has net income of $45,360, turnover of 1.4, and ROI of 12.6%. Calculate the firm's margin, sales, and average total assets. Round your percentage answer to one decimal place.