Whistle Works manufacturers safety whistle keychains. They have the following information available to prepare their master budget: Whistle Works sells each whistle for $12. It takes 3 ounces of metal to produce each whistle at a cost of $0.50 per ounce. They prefer to have 10% of materials required for the following month's production in ending inventory as well. What is the total cost of direct materials for November to meet production needs