Parker Plassic, Incorporated, manulactures plastic mats to use with rolling office chairs its standard cost information for last year follows. Parker Plastic had the following actual results for the past year Required: Calculate Parher Plasticls variable overhead rate and efficiency variances and its over-or underapplied variable overhead Note: Do not round intermediate calculations. Indicate the effoct of each variance by selecting " F " for favorable, " U " for Unfovorable, and "None" for no effect (l.e., zero verience)