eBook Show Me How Contribution Margin Sally Company sells 22,000 units at $20 per unit. Variable costs are $16.40 per unit, and fixed costs are $24,600. Determine (a) the contribution margin ratio, (b) the unit contribution margin, and (c) operating income. a. Contribution margin ratio (Enter as a whole number.) % b. Unit contribution margin (Round to the per nearest cent.) unit c. Operating income