Parker Plastic, Incorporated, manufactures plastic mats to use with rolling office chairs. Its standard cost informution for last year follows: Parker Plastic had the following actual results for the past year: Required: Calculate Parker Plastic's variable overhead rate and efficiency variances and its 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 varianco). Parker Plastic, Incorporated, manufectures 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 post year: Required: Calculate Parker Plastic's variable overhead rate and efficiency variances'and its over- or underappliad variable overhead. Note: Do not round intermediate calculations. Indicate the effect of each variance by selecting "F" for fovorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance)