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: Standard Standard Quantity Rate Standard Unit Cost Variable manufacturing 0.6 $0.80 overhead $0.48 During August, LLL had the following actual results. Units produced and sold Actual variable overhead Actual direct labor hours Required: 24,300 $ 9,420 15,300 Compute LLL's variable overhead rate variance, variable overhead efficiency variance, 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 (ie., zero variance).) Variable Overhead Rate Variance Variable Overhead Efficiency Variance Variable Overhead Spending Variance 4