4 Define marginal cost and calculate Brazil’s marginal cost of producing a tonne of food when the quantity produced is 2.5 tonnes per day.

Brazil produces biofuel from sugar, and the land used to grow sugar can be used to grow food crops. Suppose that Brazil’s production possibilities for biofuel and food crops are as follows:

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Biofuel (barrels per day) Food crops (tonnes per day) 0 1 70 and 64 and 54 and 40 and 23 3 22 and 4 0 and 5