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Blossom Industries manufactures and sells three different models of wetdry shop vacuum cleaners. Although the shop vacsvary in terms of quality and features, all are good sellers. Blossom is currently operating at full capacity with limited machine time. Per unit sales and production information relevant to each model follows. Economy Standard Deluxe Selling price $31 $ 51 $ 102 Variable costs and expenses 55 16 $ 20 $ 43 Machine hours required 0.50 0.30 1.60 (a 1) Calculate unit contribution margin. Econ0my Standard Deluxe U nit contribution margin 55 $ $