The unit rate here is also 8 cups of water per day.
We need to remember that in the unit rate we have as the denominator one unit of any quantity.
In this case, we have a day as the denominator one day, since:
[tex]\frac{8cupofwater}{1\text{day}}[/tex]In summary, therefore, the unit rate, in this case, is 8 cups of water per day:
