Harstin Corporation has provided the following data: 22 Sales $625,000 Gross margin 70,000 Net operating income 50,000 points Stockholders' equity 90,000 Average operating assets 250,000 01:45:14 Residual income 20,000 The margin for the past year was? Multiple Choice 11.2%. O 19.2%. O 14.4%. O 8.0%