Contribution Margin Molly Company sells 27,000 units at $25 per unit. Variable costs are $20.75 per unit, and fixed costs are $45,900. Determine (a) the contribution margin ratio, (b) the unit contribution margin, and (c) operating income. a. Contributiori margin ratio (Enter as a whole number.) % b. Unit contribution margin (Round to the nearest cent.) per unit c. Operating income