conversations.from: human
conversations.value: John rents his car out 10 times a month for 3 hours each time.  He gets paid $25 an hour.  If his car payment is $500, how much profit does he make on his car?
  Give me a solution to this problem
conversations.from: assistant
conversations.value: He rents his car 10*3=30 hour a month
  So he makes 25*30=$750 a month
  That means he has a profit of 750-500=$250 a month