For example, electricity costs are $$1,100$ per month plus $$0\mathrm{.}06$ per car washed. The company expects to wash $8,400$

cars in August and to collect an average of $$6\mathrm{.}40$ per car washed.

The actual operating results for August are as follows:

Required:

Calculate the company's revenue and spending variances for August. $($Indicate the effect of each variance by

selecting $"$F$"$ for favorable, $"$U$"$ for unfavorable, and "None" for no effect $($i$.$e$.,$ zero variance$).$ Input all amounts as

positive values. Do not round intermediate calculations.$)$