Conversation so far:
Who is Paul Nemenyi?
Paul Felix Nemenyi was a Hungarian mathematician and physicist who specialized in continuum mechanics.
What is the significance of Paul Nemenyi to Bobby Fischer?
Peter Nicholas and Clea Benson of The Philadelphia Inquirer published an investigative report backed by detailed and compelling evidence that indicated that Bobby Fischer's biological father was actually Paul Nemenyi

Question: How much were the monthly child support payments?
Self-contained rewrite: How much were the monthly child support payments Paul Nemenyi made to Bobby Fischer's mother?