Required: a. Firm A has a margin of 11%, sales of $630,000, and ROI of 17%. Calculate the firm's average total assets. b. Firm B has net income of $74,000, turnover of 1.30, and average total assets of $890,000. Calculate the firm's sales, margin, and ROI. c. Firm C has net income of $134,000, turnover of 2.01, and ROI of 23.50%. Calculate the firm's margin, sales, and average total assets