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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. Per unit sales and production information relevant to each model follows. (a1) Calculate unit contribution margin. Ignoring the machine time constraint, which single product should Tanek Industries produce? eTextbook and Media Attempts: 0 of 3 used (b) What is the contribution margin per unit of limited resource for each product? (Round answers to 2 decimal places, e.g. 10.50.) eTextbook and Media Attempts: 0 of 3 used (c) If additional machine time could be obtained, how should the additional time be used? The additional time should be used to produce th product