Hi i am looking for a play i reads as child?

- only thing I cant recollect the name or the author. But its about an ex- student who returns to his school and demands money, claiming that nothing useful came off his education. he is subsequently interviewed by all his teachers to check his knowledge on various subjects. He, of course feign ignorance until he is quizzed by the math teacher about how much the school owes him. the student makes the calculations and comes up with the exact amount- inadvertantly proving that he has gained knowledge