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:

Direct material: 4 pounds at $10.00 per pound$40.00Direct labor: 2 hours at $13 per hour26.00Variable overhead: 2 hours at $9 per hour18.00Total standard variable cost per unit$84.00

The company also established the following cost formulas for its selling expenses:

Fixed Cost per MonthVariable Cost per Unit SoldAdvertising$240,000Sales salaries and commissions$180,000$16.00Shipping expenses$7.00

The planning budget for March was based on producing and selling 29,000 units. However, during March the company actually produced and sold 34,000 units and incurred the following costs:

1. Purchased 160,000 pounds of raw materials at a cost of $8.50 per pound. All of this material was used in production.
2. Direct-laborers worked 59,000 hours at a rate of $14.00 per hour.
3. Total variable manufacturing overhead for the month was $564,040.
4. Total advertising, sales salaries and commissions, and shipping expenses were $245,000, $475,000, and $155,000, respectively.

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10. What is the variable overhead efficiency variance for March?(Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance.). Input the amount as a positive value.)