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Hudson manufactures two types of chairs. Office and beach. The data given below is for office chair.

Variable manufacturing cost $120

Variable operating cost $30

Sale price of the chair $200

Hudson's monthly fixed expenses amount to $200,000. Out of 10 chairs sold by the company 7 are office model and the rest are the beach variety. When Hudson sells 2000 chairs, he generates an operating income of $50,000. Calculate the contribution margin per chair for beach model.