Pardoe, Inc., 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: Standard Cost Direct materials Direct labor Variable manufacturing overhead Standard Quantity 1.5 pounds 0.6 hours 0.6 hours Standard Price or Rate $3.00 per pound $6.00 per hour $1.25 per hour $4.50 $3.60 $0.75 During March, the following activity was recorded by the company: The company produced 3,000 units during the month. A total of 8,000 pounds of material were purchased at a cost of $23,000. There was no beginning inventory of materials on hand to start the month; at the end of the month, 2,000 pounds of material remained in the warehouse. During March, 1,600 direct labor-hours were worked at a rate of $6.50 per hour. Variable manufacturing overhead costs during March totaled $1,800. The direct materials purchases variance is computed when the materials are purchased. The variable overhead rate variance for March is: $600 F $200 F $200 U $600 U