Tiago makes three models of camera lens. Its product mix and contribution margin per unit follow: Percentage of Unit Sales Contribution Margin per Unit Lens A 29% $ 39 Lens B 44 31 Lens C 27 44 Required: Determine the weighted-average contribution margin per unit. Determine the number of units of each product that Tiago must sell to break even if fixed costs are $182,000. Determine how many units of each product must be sold to generate a profit of $66,000.