! 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 $ 2,200,000 660,000 Contribution margin Fixed expenses 1,540,000 1,100,000 Net operating income $ 440,000 Average operating assets $1,375,000 5 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 %