The following materials standards have been established for a particular raw material used in the company's sole product: Standard quantity per unit of output 1.0 pound Standard price $16.60 per pound The following data pertain to operations concerning the product for the last month: Actual materials purchased 2,200 pounds Actual cost of materials purchased $34,650 Actual materials used in production 1,900 pounds Actual output 2,100 units What is the materials quantity variance for the month?