Required: a. Firm A has a margin of 12%, sales of $550,000, and ROI of 18%. Calculate the firm's average total assets. b. Firm B has net income of $74,000, asset turnover of 1.10 , and average total assets of $860,000. Calculat the firm's sales, margin, and ROI. c. Firm C has net income of $140,000, asset turnover of 1.91 , and ROI of 23.40%. Calculate the firm's margir sales, and average total assets. Complete this question by entering your answers in the tabs below. Firm A has a margin of 12%, sales of $550,000, and ROI of 18%. Calculate the firm's average total assets. Note: Round your intermediate calculation to 1 decimal place