4. Marley Corporation makes three products (X, Y,& Z) with the following characteristics: Products Y z Selling price per unit $ 10 $ 15 $ 20 Variable cost per unit $ 6 $ 10 $ 10 Machine hours per unit 2 4 10 The company has a capacity of 2,000 machine hours, but there is virtually unlimited demand for each product. In order to maximize total contribution margin, how many units of each product should the company produce