How do I calculate the Minimum Required Rate of Return given the following question?

The Willard Division's operating data for the past two years are provided below: Year 1 12 Return on investment Net operating income Turnover Margin Sales Year 2 36 360,000 3 The Willard Division's margin in Year 2 was 150% of the margin in Year 1. The net operating income for Year 1 was: The sales for Year 2 were: For the past year, the return on investment was: For the past year, the turnover used in ROI calculations was: For the past year, the minimum required rate of return was: