0 Required information [The following information applies to the questions displayed below] Westerville Company reported the following results from last year's operations: Sales: Variable expenses Contribution margin Fixed expenses Net operating income Average operating assets $ 2,200,000 660,000 1,540,000 1,100,000 $440,000 $1,375,000 At the beginning of this year, the company has a $275,000 investment opportunity with the following cost and revenue characteristics: Sales Contribution margin ratio Fixed expenses $440,000 60 % of sales $220,000 The company's minimum required rate of return is 15% 3. What is last year's return on investment (ROI)? ROI %