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Tiago makes three models of camera lens. Its product mix and contribution margin per unit follow: Percentage of Unit sales 28% Contribution Margin per unit $39 Lens A Lens B Lens c 31 44 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 $190,000. 3. Determine how many units of each product must be sold to generate a profit of $64,000