Required: a. Firm A has a margin of 11%, sales of $540,000, and ROI of 18%. Calculate the firm's average total assets. b. Firm B has net income of $74,000, turnover of 1.50, and average total assets of $880,000. Calculate the firm's sales, margin, and ROI. c. Firm C has net income of $136,000, turnover of 1.91, and ROI of 23.20%. 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 11%, sales of $540,000, and ROI of 18%. Calculate the firm's average total assets. (Round "Turnover" to 1 decimal place.) Average total assets