Kahn Performance Nutrition produces a protein shake that contains whey protein as one of its ingredients. The whey protein (materials) standards for each batch of protein shake produced are 12 pounds of whey protein at a standard cost of $3 per pound. During July, Kahn Performance Nutrition purchased and used 54,000 pounds of whey protein at a total of $170,000 to make a total of 4,300 batches of protein shake. What is the materials quantity variance for whey protein in July?