In which of the following scenarios (question 8 through 11) would a court likely find there to be adequate consideration in order to enforce the agreement? (Put a "yes consideration" or "no consideration" in the blanks.)

8. A father promises to give his 18 year old son $500 on his 23^rd birthday if his son graduates from college before his 23rd birthday with at least a "B" average, and the son does so. __________________