produces class rings. Its best-selling model has a direct materials standard of 7 grams of a special alloy per ring. This special alloy has a standard cost of $ 64.90 per gram. In the past month, the company purchased 7 comma 300 grams of this alloy at a total cost of $ 470 comma 120. A total of 7 comma 100 grams were used last month to produce 1 comma 000 rings