a. Firm A has a margin of 14%, sales of $640,000, and ROI of 18%. Calculate the firm's average total assets. b. 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 c. Firm C has net income of $142,000, asset turnover of 1.81, and ROI of 23.60%. Calculate the firm's margin, sales, and average total assets. Complete this question by entering your answers in the tabs below. Required A Required B Required C 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. Note: Round "Margin" and "ROI" answers to 1 decimal place. Sales Margin ROI % %