Exercise 3-13 (Algo) ROI analysis using the DuPont model LO 3-3 Required: a. Firm A has a margin of 13%, sales of $630,000, 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 $940,000. Calculate the firm's sales, margin, and ROI. c. Firm C has net income of $136,000, asset turnover of 1.81 , and ROI of 23.30%. Calculate the firm's margin, sales, and average total assets. Complete this question by entering your answers in the tabs below. Firm A has a margin of 13%, sales of $630,000, and ROI of 18%. Calculate the firm's average total assets. Note: Round your intermediate calculation to 1 decimal place