conversations.from: human
conversations.value: John chops down 30 trees.  From each tree, he can make 25 planks.  A table takes 15 planks to make and sells for $300.  He paid $3000 for all the labor.  How much profit did he make?
  Give me a solution to this problem
conversations.from: assistant
conversations.value: He got 30*25=750 planks
  So he can make 750/15=50 tables
  That means he makes 50*300=$15000
  So his profit was 15000-3000=$12000