See Clear Company manufactures clear plastic CD cases. It applies variable overhead based on the number of machine hours used. Information regarding See Clears overhead for the month of December follows: Standard Quantity Standard Rate Standard Unit Cost Variable manufacturing overhead 0.1 machine hours per case $ 0.60 per machine hour $ 0.06 During December, See Clear had the following actual results: Number of units produced and sold 628,000 Actual variable overhead cost $ 30,240 Actual machine hours 63,000 Required: Compute See Clears variable overhead rate variance, variable overhead efficiency variance, and over- or underapplied variable overhead. Note: Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance)