Required information [The following information applies to the questions displayed below] Preble Company manufactures one product, Its variable manufacturing overhead is applied to production based on direct labor-hours and its standard cost card per unit is as follows: The planning budget for March was based on producing and selling 15,000 units. However, during March the company actually produced and sold 17,000 units and incurred the following costs: a. Purchased 170,000 pounds of raw materials at a cost of $8.00 per pound. All of this material was used in production. b. Direct laborers worked 64,000 hours at a rate of $14 per hour. c. Total variable manufacturing overhead for the month was $513,920. 14. What is the variable overhead rate variance for March? Note: Round the actual overhead rate to two decimal places. Indicate the effect of each variance by selecting "F" for favorable, " U " for unfavorable, and "None" for no effect (i.e., zero variance.). Input all amounts as positive values