Required: Firm D has net income of $54,000, sales of $1,200,000, and average total assets of $750,000. Calculate the firms margin, turnover, and ROI. Firm E has net income of $132,000, sales of $2,200,000, and ROI of 9.6%. Calculate the firms turnover and average total assets. Firm F has ROI of 12%, average total assets of $1,500,000, and turnover of 0.8. Calculate the firms sales, margin, and net income