Priya (8:45 PM): ok the total came to $186 for the table, that's $31 each for the six of us. Devon (8:47 PM): sounds right, I'll venmo you now. Priya (8:50 PM): oh wait, since you and Sam split that one appetizer that nobody else touched, you two should probably just split its $18 cost between yourselves on top of your $31. Devon (8:52 PM): fair enough, I'll add $9 then. Priya (8:53 PM): perfect, so $40 from you total.
Main Purpose
What is the main purpose of this text exchange?