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Contribution Margin United Merchants Company sells 40,000 units at $32 per unit. Variable costs are $23.68 per unit, and fixed costs are $143,100 Determine (a) the contribution margin ratio, (b) the unit contribution margin, and (c) income from operations 1,689 X % a. Contribution margin ratio (Enter as a whole number.) b. Unit contribution margin (Round to the nearest cent.) per unit c. Income from operations