The city of Modesto has two plants which are producing fertilizer. In the process Plant Anaconda emits a total of 9 tons of pollution a day with a marginal cost of abatement expressed as MC = 9- Xa, where Xa is tons of pollution. Plant Barboa in a similar fashion emits a total of 6 tons a day with a MC of abatement = 12 - 2Xb where Xb is tons of pollution. Modesto wants to reduce this level from 15 to only 9 tons of pollution a day. If t applied a tax perfectly, what is the level of that tax which would achieve a total of 9 tons of pollution total across the two plants? %3D %3D

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