Tiago makes three models of camera lens. Its product mix and contribution margin per unit follow: Percentage of Unit Contribution Margin Lens A Lens B Lens C Required: Sales 25% 44 31 per Unit $ 39 31 44 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 $184,000. 3. Determine how many units of each product must be sold to generate a profit of $73,000.