Westerville Company reported the following results from last year's operations: Sales Variable expenses Contribution margin Fixed expenses Net operating income Average operating assets $ 2,000,000 640,000 1,360,000 860,000 $ 500,000 $ 1,250,000 At the beginning of this year, the company has a $250,000 investment opportunity with the following cost and revenue characteristics: Sales $ 400,000 Contribution margin ratio 70 of sales Fixed expenses $ 220,000 The company's minimum required rate of return is 10%.