Final answer:
The unit rate for $100 for every five guests is $20 per guest, which is calculated by dividing $100 by 5.
Step-by-step explanation:
To find the unit rate for $100 for every five guests.
To calculate a unit rate, you divide the total amount by the number of units.
In this case, we divide $100 by 5 guests to find the cost per guest.
$100 ÷ 5 guests = $20 per guest
So, the unit rate is $20 per guest.