eBook Hint Print eferences 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 1,020,000 11,300,000 $ 7,910,000 306,000 3,335,400 $ 630,000 $363,000 Variable Overhead Rate Variance Variable Overhead Efficiency Variance Variable Overhead Spending Variance $ Required: Calculate Parker Plastic's variable overhead rate and efficiency variances and its over- or Note: Do not round intermediate calculations. Indicate the effect of each variance by se unfavorable, and "None" for no effect (i.e., zero variance).