To find the unit rate price per ounce for the 64 oz. bottle of root beer that costs $3.20, you can use the following calculation:
- Divide the total cost by the total ounces:
\[ \text{Unit price per ounce} = \frac{\text{Cost}}{\text{Ounces}} = \frac{3.20}{64} \]
- Perform the division:
\[ \frac{3.20}{64} = 0.05 \]
Therefore, the unit rate price per ounce is $0.05.