ROI analysis using the DuPont model a. Firm D has net income of $54,000, sales of $1,200,000, and average total assets of $750,000. Calculate the firm's margin, turnover, and ROI. b. Firm E has net income of $132,000, sales of $2,200,000, and ROI of 9.6%. Calculate the firm's turnover and average total assets. c. Firm F has ROI of 12%, average total assets of $1,500,000, and turnover of 0.8 . Calculate the firm's sales, margin, and net income. Round your answers to the nearest whole numbers