Westerville Company reported the following results from last year's operations: Sales Variable expenses Contribution margin Fixed expenses Net operating income Average operating assets $ 1,800,000 740,000 1,060,000 700,000 $ 360,000 $ 1,200,000 At the beginning of this year, the company has a $400,000 investment opportunity with the following cost and revenue characteristics: Sales Contribution margin ratio Fixed expenses $ 600,000 60. of sales $ 288,000 The company's minimum required rate of return is 10%. Foundational 11-1 Required: 1. What is last year's margin? Margin Margin