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A farmer can use his land to produce either maize or wheat. The possible combinations are: Combination A = 0 tons of maize and 100 tons of wheat; Combination B = 20 tons of maize and 90 tons of wheat; Combination C = 40 tons of maize and 75 tons of wheat. The farmer moves from Combination B to Combination C. What is the opportunity cost of producing the additional maize?