Lamp Light Limited (LLL) manufactures lampshades. It applies variable overhead on the basis of direct labor hours, Information from LLL's standard cost card follows: During August, LLL had the following actual results: Required: Compute LLL's variable overhead rate variance, variable overhead efficiency varlance, and over-or underapplied variable overhead. (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).)