Come up with a question and reasoning that would justify this answer: 30
user
The question is: Mark wants to tip his server 20% on a $200 check. If his friend agrees to kick in $10, how much should Mark add?
Step-by-step reasoning process: First find the total tip amount: 20% * $200 = $40. Then subtract the friend's contribution: $40 - $10 = $30.

assistant