conversations.from: human
conversations.value: I would love to understand how to solve this problem: John's hair grows 1.5 inches every month.  Every time it gets to 9 inches long he cuts it down to 6 inches.  A haircut costs $45 and he gives a 20% tip.  How much does he spend on haircuts a year?
  Can you explain?
conversations.from: assistant
conversations.value: He cuts off 9-6=3 inches when he gets a haircut
  That means he needs to cut it every 3/1.5=2 months
  So he gets 12/2=6 haircuts a year
  He gives a 45*.2=$9 tip
  So that means each hair cut cost 45+9=$54
  So he pays 54*6=$324 a year