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 $1,400,000 510,000 890,000 610,000 $ 280,000 Average operating assets $ 875,000 At the beginning of this year, the company has a $175,000 investment opportunity with the following cost and revenue characteristics: Sales $ 280,000 Contribution margin ratio 50% of sales $ 98,000 Fixed expenses The company's minimum required rate of return is 15%. 3. What is last year's return on investment (ROI)? (Round your intermediate calculations to 1 decimal place.) RO %