Westerville Company reported the following results from last year's operations: Sales $ 2,300,000 Variable expenses 670,000 Contribution margin 1,630,000 Fixed expenses 1.170,000 Not operating income 5460,000 Average operating assets $ 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 50 of sales Tixed expenses 161,000 The company's minimum required rate of return is 15% Required: 7. What is last year's margin? Margin 24