Gant Co. manufactures a product with a standard direct labor cost of two hours at $12.00 per hour. During July, 2,000 units were produced using 4, 200 hours at $12.20 per hour. The labor quantity variance was a. $2, 440 F. b $2, 400 U. c. $1, 640 U. d. $2, 440 U. The overhead variances measure whether overhead costs Are Effectively Managed a. Controllable b. Controllable Were Used Effectively Controllable and Volume Volume