Parker Plastic, Incorporated, manufactures 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 Parker Plastic's variable overhead tate and efficiency vatiances and its over - or underapplied varlable overhead. Note: Do not round intermediote colculations, Indicote the effect of eoch variance by selecting "F" for fovorable, "U" for unfoverable, and "None" for no effect (Le, zero variance)