Required: Firm D has net income of $68,000, sales of $1,600,000, and average total assets of $810,000. Calculate the firm's margin, turnover, and ROI. Firm E has net income of $132,000, sales of $2,200,000, and ROI of 14.4%. Calculate the firm's turnover and average total assets. Firm F has ROI of 12.60%, average total assets of $1,800,700, and turnover of 1.40. Calculate the firm's sales, margin, and net income