Required: a. Firm A has a margin of 8%, sales of $630,000, and ROl of 16.8%. Calculate the firm's average total assets. b. Firm B has net income of $246,400, turnover of 1.1, and average total assets of $1,600,000. Calculate the firm's sales, margin, and ROI. c. Firm C has net income of $43,500, turnover of 2.9, and ROI of 23.2%. Calculate the firm's margin, sales, and average total assets