Original volume (cartons) Add: Increase in volume New volume (cartons) Multiplied by: Unit contribution margin New total contribution margin Less Fixed expenses New operating income vs. Operating income before change in volume Increase in operating income Enter any number in the edit fields and then click Check Answer Original volume (cartons) Add: Increase in volume New volume (cartons) Multiplied by: Unit contribution margin New total contribution margin Less Fixed expenses New operating income vs. Operating income before change in volume Increase in operating income Enter any number in the edit fields and then click Check