Tony was asked to bring root beer floats to the end of year class party. He is only given so much money for his budget. He finds a 64 ounce bottle for $3.20. What is the unit rate price per ounce?

To find the unit rate price per ounce, divide the total cost by the number of ounces in the bottle. The unit rate price per ounce is $3.20/64 oz = $<<3.20/64=0.05>>0.05/oz. Answer: \boxed{0.05}.