eBook Show Me How Contribution Margin Willie Company sells 36,000 units at $15 per unit. Variable costs are $8.40 per unit, and fixed costs are $123,600. Determine (a) the contribution margin ratio, (b) the unit contribution margin, and (c) operating Income. % per unit a. Contribution margin ratio (Enter as a whole number.) b. Unit contribution margin (Round to the nearest cent.) c. Operating income