Tiago makes three models of camera lens. Its product mix and contribution margin per unit follow: Percentage of Unit sales Lens A Lens B Lens C 22 % 39 39 Contribution Margin per unit $39 31 Required 1. Determine the weighted-average contribution margin per unit. (Round your intermediate calculations and final answer to 2 decimal places.) ei verage per unit 2. Determine the number of units of each product that Tiago must sell to break even if fixed costs are $192,000. (Round intermediate calculations and final answers to the nearest whole num ber.) Units of A Units of B Units of C Units Units Units 3. Determine how many units of each product must be sold to generate a profit of $78,000. (Round intermediate calculations and final answers to the nearest whole number.) Units of A Units of B Units of C Units Units Units