Required: a. Firm A has a margin of 10%, sales of $520,000, and ROI of 17%. Calculate the firm's average total assets. b. Firm B has net income of $76,000, asset turnover of 1,30 , and average total assets of $890,000. Calculate the firm's sales, margin, and ROI. c. Firm C has net income of $134,000, 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 C has net income of $134,000, asset turnover of 1.81 , and ROI of 23.30%. Calculate the firm's margin, sales, and average total assets. Note: Round "Margin" answer to 1 decimal place and use the rounded answer for the subsequent computations