Lamp Light Limited (LLL) manufactures lampshades. It applies variable overhead on the basis of direct labor hours. Information from LL's standard cost card foliows: During August, LLL had the following actual results: Required: Compute LLL's variable overhead rate variance, variable overhead efficiency variance, and over-or underapplied variable overhead. Note: Do not round intermediate calculations. Indicate the effect of each variance by selecting " F " for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance)