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 sollers. Tanek is currently operating at full capacity with limited machine time Sales and production information relevant to each model follows Product Economy Standard Deluxe Selling price $31 $51 $102 Variable costs and expenses $16 $20 $48 Machine hours required 05 0.8 16 Calculate contribution margin per unit Product Economy Standard Dekoxe Contribution margin $ per unit eTextbook and Media Ignoring the machine time constraint, which single product should Tanek Industries produce