For example, electricity costs should be $1,100 per month plus $0.05 per car washed. The company expects to wash 8,500 cars in August and to collect an average of $6.90 per car washed. The company actually washed 8,600 cars in August. Required: Calculate the company's activity variances for August. (Indicate the effect of each variance by selecting "F" for favorable, "U" for Infavorable, and "None" for no effect (i.e., zero variance). Input all amounts as positive values.)