of 15 ook Pint rences Required information The Foundational 15 (Algo) [LO10-1, LO10-2] [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 $ 2,300,000 670,000 1,630,000 1,170,000 $460,000 $ 1,437,500 At the beginning of this year, the company has a $287,500 investment opportunity with the following cost and revenue characteristics: Sales $460,000 Contribution margin ratio Fixed expenses 50 of sales $161,000 The company's minimum required rate of return is 15% Foundational 10-1 (Algo) Required: 1. What is last year's margin? Margin