Margin, Turnover, Return on Investment, Average Operating Assets Park Company provided the following income statement for last year: Sales Less: Variable expenses $90,000 54,000 $36,000 19,600 $16,400 Contribution margin Less: Fixed expenses Operating income At the beginning of last year, Park had $38,620 in operating assets. At the end of the year, Park had $41,380 in operating assets. Required: Compute ROl. minus sign to indicate a negative ROL. Do not round interim calculations, but do round your final answer to two decimal places. If required, use a ROI