Parker Plastic, Inc., manufactures plastic mats to use with rolling office chairs. Its standard cost information for last year follows: Standard Quantity Standard Price (Rate) Standard Unit Cost Direct materials (plastic) 12 sq ft. $ 1.00 per sq. ft. $ 12.00 Direct labor 0.25 hr. $ 12.80 per hr. 3.20 Variable manufacturing overhead (based on direct labor hours) 0.25 hr. $ 2.00 per hr. 0.50 Fixed manufacturing overhead $559,200 932,000 units) 0.60 Parker Plastic had the following actual results for the past year: Number of units produced and sold 1,260,000 Number of square feet of plastic used 12,500,000 Cost of plastic purchased and used $ 11,250,000 Number of labor hours worked 330,000 Direct labor cost $ 4,026,000 Variable overhead cost $ 1,480,000 Fixed overhead cost $ 387,000 Required: Calculate Parker Plastics variable overhead rate and efficiency variances and its over- or underapplied variable overhead. (Do not round intermediate calculations. Indicate the effect of each variance by selecting "F" for Favorable/Overapplied and "U" for Unfavorable/Underapplied.)