Tiago makes three models of camera lens. Its product mix and contribution margin per unit follow: Percentage of Unit Sales Contribution Margin per Unit Lens A 34% $ 34 Lens B 33 26 Lens C 33 39 Suppose the product mix has shifted to 39%/31%/30%. Required: Determine the new weighted-average contribution margin per unit. Determine the number of units of each product that Tiago must sell to break even if fixed costs are $193,000. Suppose the product mix has shifted to 39%/31%/30%. Determine how many units of each product must be sold to generate a profit of $79,000 if fixed costs are $193,000. Suppose the product mix has shifted to 39%/31%/30%