Lavage Rapide 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 $$1,300$ per month plus $$0\mathrm{.}08$ per car washed the company expects

wash $8,300$ cars in August and to collect an average of $$6\mathrm{.}80$ per car washed.

The actual operating results for August are as follows: