Firm A has a margin of 14%, sales of $540,000, and ROI of 18%. Calculate the firm's average total assets. Firm B has net income of $72,000, asset turnover of 1.40, and average total assets of $920,000. Calculate the firm's sales, margin, and ROI. Firm C has net income of $134,000, asset turnover of 1.81, and ROI of 23.40%. Calculate the firm's margin, sales, and average total assets.