Tiago makes three models of camera lens. Its product mix and contribution margin per unit follow: Lens A Tens D ens C Percentage of Unit sales 228 42 36 Contribution Margin per unit $42 34 47 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 $183 000. 3. Determine how many units of each product must be sold to generate a profit of $73,000