Begin by selecting the formula labels and then entering the amounts to compute the contribution margin per unit. Net sales revenue per unit $ 120 Variable costs per unit 30 = = $ Contribution margin per unit 90 Begin by selecting the formula labels and then entering the amounts to compute the number of tickets Funday must sell to break even. (Abbrevision used: CM = contribution margin. Complete all input fields. For items with a zero value, enter "0".) = Required sales in units