Lavage Rapide owns and operates a large automatic car wash facility near Montreal. The following table provides estimates concerning the company$$s costs:

Fixed Cost per Month Cost per Car Washed

Cleaning supplies $ $0\mathrm{.}80$

Electricity $ $1,200$ $ $0\mathrm{.}07$

Maintenance $ $0\mathrm{.}25$

Wages and salaries $ $4,500$ $ $0\mathrm{.}30$

Depreciation $ $8,200$

Rent $ $1,900$

Administrative expenses $ $1,600$ $ $0\mathrm{.}03$

For example, electricity costs should be $$1,200$ per month plus $$0\mathrm{.}07$ per car washed. The company expects to wash $8,400$ cars in August and to collect an average of $$6\mathrm{.}30$ per car washed. The company actually washed $8,500$ cars in August.

Required:

Calculate the company's activity variances for August.