17. Kelchner Corporation has provided the following contribution format income statement. Assume that the following information is within the relevant range. Sales (3,000 units) $ 180,000 Variable expenses 108,000 Contribution margin 72,000 Fixed expenses 62,400 Net operating income $ 9,600 The contribution margin ratio is closest to: a. 67% b. 40% c. 33% d. 60%