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 $ 1,200,000 320,000 880,000 540,000 $ 240,000 $ 600,000 At the beginning of this year, the company has a $150,000 investment opportunity with the following cost and revenue characteristics Sales Contribution margin ratio Fixed expenses $ 240,000 50% of sales $ 84,000 The company's minimum required rate of retum is 15%. 11. What is last year's residual income