Whistle Works manufacturers safety whistle keychains. They have the following information available to prepare their master budget: Units to be produced October 4700 November 5450 December 6020 Whistle Works sells each whistle for $14. It takes 4 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. How many ounces of direct materials does Whistle Works need to purchase in October to meet production needs? 18,500 ounces 19,100 ounces 6320 ounces 4700 ounces