Tiago makes three models of camera lens. Its product mix and contribution margin per unit follow Percentage of Un unho Contribution Margin per sales unit Lens A 40% $45 Lens B 30 37 Lens C 30 50 Suppose the product mix has shifted to 45/28/27 Required: 1. Determine the new weighted-average contribution margin per unit 2. Determine the number of units of each product that Tiago must sell to break even if fixed costs are $180,000 3. Determine how many units of each product must be sold to generate a profit of $67,000. Answer is complete but not entirely correct