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18) Dodge Industries incurs the following costs during the current year: Sales for the year were $80,000 and Dodge determined that only the direct production costs and factory supplies are to be classified as variable costs; all other costs are classified as fixed costs. Dodge sold 400 units. (a) Calculate the unit contribution margin and the contribution margin ratio for Dodge Industries. (b) Dodge Industries is considering plans that would increase the contribution margin ratio for next year. Should it pursue these plans? Explain