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 tecorded by the company: - The company produced 2,400 units during the month. - A total of 19,400 pounds of material were purchased at a cost of $13,580. - There was no beginning inventory of materials on hand to start the month; at the end of the month, 3,620 pounds of materlal remained in the warehouse. - During March, 1,090 direct labor-hours were worked at a rate of $30,50 per hour - Varlable manufacturing overhead costs during March totalod \$14,061. The direct materials purchases variance is computed when the materials are purchased. The labor officiency variance for March is: $3.685U 53.040F $3,685F $3.040U