Parker Plastic, Inc., manufactures plastic mats to use with rolling office chairs. Its standard cost information for last year follows: Standard Standard Standard Price (Rate) $ 0.90 per sq. ft $12.60 per hr. Quantity 15 sq ft 0.25 hr Unit Cost Direct materials (plastic) $13.50 3.15 Direct labor Variable manufacturing overhead (based on direct labor hours) Fixed manufacturing overhead $539,400 930,000 units) 0.25 hr $ 1.80 per hr 0.45 0.58 Parker Plastic had the following actual results for the past year: Number of units produced and sold Number of square feet of plastic used Cost of plastic purchased and used Number of labor hours worked 1,240,000 12,400,000 $ 9,920,000 328,000 $ Direct labor cost 3,968,800 $ 1,350,000 $ Variable overhead cost Fixed overhead cost 385,000 Required: Calculate Parker Plastic's 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.) Variable Overhead Rate Variance Variable Overhead Efficiency Variance Variable Overhead Spending Variance