Parker Plastic, Inc., manufactures plastic mats to use with rolling office chairs. Its standard cost information for last year follows: Standard Standard Price Standard Quantity (Rate) Unit Cost Direct materials (plastic) 12 sq ft. $ 1. 10 per sq. ft. $13.20 Direct labor 0.25 hr. $13. 20 per hr. 3.30 Variable manufacturing overhead (based on direct labor hours) 0.25 hr. $ 2.20 per hr. 0.55 Fixed manufacturing overhead ($579, 080 + 934, 000 units) 0. 62 Parker Plastic had the following actual results for the past year: Number of units produced and sold 1, 280, 090 Number of square feet of plastic used 12, 600, 900 Cost of plastic purchased and used $12, 600, 000 Number of labor hours worked 332, 000 Direct labor cost $ 4, 083, 600 Variable overhead cost $ 1,589, 000 Fixed overhead cost 389, 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