Jake's Roof Repair has provided the following data concerning its costs:

For example, wages and salaries should be $$20,900$ plus $$15\mathrm{.}00$ per repair$-$hour. The company expected to work $2,900$

repair$-$hours in May, but actually worked $2,800$ repair$-$hours. The company expects its sales to be $$53\mathrm{.}00$ per repair$-$hour.

Required:

Compute the company's activity variances for May. $($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.$)$