Heyden Company has fixed costs of $531,600. The unit selling price, variable cost per unit, and contribution margin per unit for the company's two products follow: Product Model Selling Price Variable Cost per Unit Contribution Margin per Unit Yankee $100 $40 $60 Zoro 140 80 60 The sales mix for products Yankee and Zoro is 20% and 80%, respectively. Determine the break-even point in units of Yankee and Zoro. a. Product Model Yankee units b. Product Model Zoro units