This question came to the Beis Horah last week:
Someone who is magia seforim takes (lets say for example) 100 shekels to do a cerain job. He however decided to get the job to his daughter to do instead (who does just as good a job of him) however without the knowledge of the one who gave over the sefer. He pays his daughter 80 shekels and keeps the other 20 shekels for himself. Is there any shailo in this? If this is a problem to where can one find a source in Shulchan Aruch or Poskim?