Freytag Corporation's variable overhead is applied on the basis of direct labor$-$hours. The company has established the following variable overhead standards for product N$06$C:

Standard direct labor$-$hours $3\mathrm{.}5$ hours per unit of N$06$C

Standard variable overhead rate $ $5\mathrm{.}30$ per hour

The following data pertain to the most recent month's operations during which $1,600$ units of product N$06$C were made:

Actual direct labor$-$hours worked $5,500$

Actual variable overhead incurred $ $29,640$

Required:

What was the variable overhead rate variance for the month?

What was the variable overhead efficiency variance for the month?

Note: 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.