3 Required: a. Firm A has a margin of 12% sales of $550,000, and ROI of 18% Calculate the firm's average total assets. b. Firm B has net income of $72,000, turnover of 1.10, and average total assets of $860.000. Calculate the firm's sales, margin, and ROL c. Firm C has net income of $138,000, turnover of 1.91, and ROI of 23.70%, Calculate the firm's margin, sales, and average total assets. Complete this question by entering your answers in the tabs below. Required A Required B Required C Firm A has a margin of 13%, sales of $550,000, and ROI of 18%. Calculate the firm's average total assets. (Round "Turnover" to 1 decimal place.) Average total assets