What is the labor spending variance for March?

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 30,000 units. However, during March the company actually produced and sold 34,500 units and incurred the following costs: a. Purchased 150,000 pounds of raw materials at a cost of $9.20 per pound. All of this material was used in production. b. Direct laborers worked 62,000 hours at a rate of $17 per hour. c. Total variable manufacturing overhead for the month was $390,600