At a banquet for 300 people, a line cook serves 6 ounces of sautéed spinach instead of 4 ounces to...

At a banquet for 300 people, a line cook serves 6 ounces of sautéed spinach instead of 4 ounces to each customer. What is the cost of the extra spinach that was served if the as served cost of the spinach is $0.30 per ounce?