Any help as to how I can go about determining what last years ROI is?

@ Req uired information The Foundational 15 [LO11-1, LO11-2] [The 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 900,000 Fixed expenses 660,000 Net operating income $ 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 5 312,000 The company's minimum required rate of return is 15%. \\ l Foundational 11-3 3. What is last year's return on investment (ROI)