Required: a. Firm D has net income of $62,100, sales of $1,380,000, and average total assets of $690,000. Calculate the firm's margin, turnover, and ROI b. Firm E has net income of $139,200, sales of $2,320,000, and ROI of 12% Calculate the firm's turnover and average total assets. c. Firm Fhas ROI of 60.00%, average total assets of $345.000, and turnover of 4.00. Calculate the firm's sales, margin, and net income