Puvo, Incorporated, manufactures a single product in which variable manufacturing overhead is assigned on the basis of standard direct labor-hours. The company uses a standard cost system and has established the following standards for one unit of product: During March, the following activity was recorded by the company: - The company produced 3,100 units during the month. - A total of 20,100 pounds of material were purchased at a cost of $14,280 - There was no beginning inventory of materials on hand to start the month; at the end of the month, 4,320 pounds of material remained in the warehouse. - During March, 1,160 direct labor-hours were worked at a rate of $37.50 per hour. - Variable manufacturing overheod costs during March totaled $14,761. The direct materials purchases variance is computed when the moterials are purchased. The variable overhead rate variance for March is