EverKleen Pool Services provides weekly swimming pool maintenance in Atlanta. Dozens of firms provide this service. The service is standardized; each company cleans the pool and maintains the proper levels of chemicals in the water. The service is typically sold as a four-month summer contract. The market price for the four-month service contract is $115. EverKleen Pool Services has fixed costs of $3,500. The manager of EverKleen has estimated the following marginal cost function for EverKleen, using data for the last two years:

SMC = 125 - 0.420 + 0.0021