Please help!! Seven friends accept the invitation to the twins' birthday party. At the last minute, Tomas and Emilio learn that their neighbor also wants to attend. The twins realize that they can stay within their budget by buying different amounts of popcorn.
Small popcorn that serves 1 = $4.50,
Medium popcorn that serves 2 = $5.75,
Large popcorn that serves 2-3 = $6.50.

Describe a different popcorn scenario that will allow the twins to bring 8 friends, including their neighbor, and still stay within their budget.

Your description must be able to be proven mathematically and make sense