Any help as to how I can go about determining the ROI related to this years investment opportunity?

The Foundational 15 [L011-1, L011-2] [T he following information applies to the questions displayed below. ] Westerville Company reported the following results from last year's operations: Sales $ 1,600,000 Variable expenses 700 , 000 Contribution margin 9 00 , 00 0 Fixed expenses 660,000 Net operating income 5 240 , 000 Average operating assets $ 1,000,000 At the beginning of this year, the company has a $325,000 investment opportunity with the following cost and revenue characteristics: Sales $ 520,000 Contribution margin ratio 70 % of sales Fixed expenses $ 312,000 The company's minimum required rate of return is 15%. \\ Foundational 11-6 6. What is the ROI related to this year's investment opportunity