. 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 $ 1,200,000 320,00 880,000 640, $ 240,00 $ 600,000 At the beginning of this year, the company has a $150,000 investment opportunity with the following cost and revenue characteristics: Sates Contribution nargin ratio Fixed expenses $ 240,00 Se of sales $ 84,000 The company's minimum required rate of return is 15% 3. What is last year's return on investment (RON? RO