Dacker Products is a division of a major corporation. The following data are for the most recent year of operations: Sales 36,480,000 Net operating income 2,808,960 Average operating assets 8,000,000 The company's minimum required rate of return 16% The division's margin used to compute ROI is closest to: O 29.6% 35.1% O 21.9% O 7.7%