The attached table shows the marginal costs of abatement for two power plants in the country of Aztonia. Each powerplant is currently emitting 30 tons/year of green house gases. If the marginal cost of pollution is $27 per ton, what is the combined optimal amount of green house gas emissions by these two powerplants? Amount of abatement Powerplant A Powerplant B

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A: factors of 24 that add up to 10

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