springville, Virginia, is interested in improving the quality of its lake by decreasing the level of water pollution. (Note that Springville is already meeting required environmental regulations.) The level of a chemical pollutant in a lake is measured in parts per million (ppm). The lake currently has a pollution level for this chemical of 100 parts per million. The table to the right shows the costs associated with cleaning the lake.Amount of Cleanup Total Cost 10 ppm cleaner $192,000 20 ppm cleaner $395,000 30 ppm cleaner $650,000 40 ppm cleaner $1,020,0004.2. Springville gets its drinking water from the lake. If it can reduce the amount of pollution in the lake, the town can spend less on treating drinking water and still achieve the same level of safety. The table below represents the marginal costs of cleaning the lake and the marginal benefits (in terms of reduced costs for treating drinking water). Cleanup Marginal Cost Marginal Benefit 1st 10 ppm of cleanup $192,000 $238,000 2nd 10 ppm of cleanup $203,000 $274,000 3rd 10 ppm of cleanup $255,000 $305,000 4th 10 ppm of cleanup $370,000 $355,000 Based on the economic costs and benefits, which of these four levels of cleanup would be sensible for the community to undertake? A. A total of 40 ppm of cleanup B. A total of 30 ppm of cleanup C. A total of 20 ppm of cleanup D. A total of 10 ppm of cleanup
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