Tlago makes three models of camera lens. Its product mix and contribution margin per unit follow Lens A Lens B Lens C Percentage of Unit sales 24% 41 35 Contribution Margin per unit $37 29 42 Required: 1. Determine the 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 $187,000 3. Determine how many units of each product must be sold to generate a profit of $67,000