help needed

Lavage Rapide is a Canadian company that owns and operates a large automatic car wash facility near Montreal, The following table provides estimates concerning the company's costs: For example, electricity costs should be $1,200 per month plus $0.15 per car washed. The company expects to wash 9,000 cars in August and to collect an average of $4,90 per car washed. The company actually washed 8,800 cars in August