Twо plаnts аre emitting а pоllutant called gunk. Plant A has marginal reductiоn costs of MCa = 20 - Xa, and Plant B has MCb = 20 - 2Xb, where X is the pollution level. Currently, Plant A emits 15 units and Plant B emits 7 units.a) Calculate the marginal cost of reduction for each plant at their current pollution levels.b) If the regulatory goal is to reduce total pollution to 20 units, what is the cost-effective allocation of pollution between the two plants?c) Calculate the total cost of achieving this reduction under the cost-effective allocation versus a uniform reduction where each plant must reduce to 10 units.