To find the unit rate price per ounce for Rosie's hot chocolate, you can divide the total cost by the number of ounces.
The cost of the hot chocolate is $5.00 for 20 ounces.
Unit rate price per ounce = Total cost / Total ounces Unit rate price per ounce = $5.00 / 20 oz Unit rate price per ounce = $0.25 per ounce
So, the unit rate price per ounce for her hot chocolate is $0.25.