Required: a. Firm A has a margin of 11%, sales of $520,000, and ROI of 19%. Calculate the firm's average total assets. b. Firm B has net income of $76,000 turnover of 110, and average total assets of $910,000, Calculate the firm's sales, margin, and ROI c. Firm C has net income of $142,000, turnover of 1.81, and ROI of 23.80%. Calculate the firm's margin, sales, and average total assets