Tanek Industries manufactures and sells three different models of wet-dry shop vacuum cleaners. Although the shop vacs vary in terms of quality and features, all are good sellers. Tanek is currently operating at full capacity with limited machine time. Sales and production information relevant to each model follows. Calculate contribution margin per unit. Ignoring the machine time constraint, which single product should Tanek Industries produce? What is the contribution margin per unit of limited resource for each product? (Round answers to 2 decimal places, e.g.10.50.)