Margin, Turnover, Return on Investment, Average Operating Assets Liu Company provided the following income statement for last year: Sales $101,500 Less: Variable expenses 59,500 Contribution margin 542,000 Less: Fixed expenses 14,800 Operating income 527,200 At the beginning of last year, Liu had $38,580 in operating assets. At the end of the year, Liu had 541,320 in operating assets. Required: 1. Compute average operating assets. If required, round the nearest dollar 2. Compute the margin and turnover ratios for last year. If required, round your answers to two decimal places. Margin = % Turnover = 3. Compute ROI. If required, round to the nearest whole number. ROI = %