The Hum Division of the Ho Company reported the following data for last year: Net operating income $ 150,000 Interest expense $ 50,000 Tax expense $ 30,000 Stockholders' equity $ 200,000 Average operating assets $ 600,000 Minimum required rate of return 12% The return on investment (ROI) last year for the Hum Division was: Multiple Choice 75% 25% 35% 12%