Parker Plastic, Inc., manufactures plastic mats to use with rolling office chairs. Its standard cost information for last year follows: Direct materials (plastic) Direct labor Variable manufacturing overhead Standard Quantity Standard Standard Price (Rate) Unit Cost $ 0.63 per sq. ft. $5.04 8 sq ft. 0.26 hr. $10.50 per hr. 0.26 hr. $ 1.50 per hr. (based on direct labor hours) Fixed manufacturing overhead ($308,040 906,000 units) 2.73 0.39 0.34 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 Direct labor cost Variable overhead cost Fixed overhead cost 1,220,000 11,200,000 $ 6,720,000 305,000 $ 3,233,000 $ 540,000 361,000 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, "U" for unfavorable, and "None" for no effect (i.e., zero variance).) Variable Overhead Rate Variance Variable Overhead Efficiency Variance Variable Overhead Spending Variance