E9-17 (Algo) Calculating Variable Manufacturing Overhead Variances [LO 9-5] See Clear Company manufactures clear plastic CD cases. It applies variable overhead based on the number of machine hours used. Information regarding See Clear's overhead for the month of December follows: Required: Compute See Clear'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)