conversations.from: human
conversations.value: John buys 10 bottles of scotch for a total cost of $600.  He also buys twice as many bottles of cognac that cost 50% more per bottle.  How much does he spend on everything?
  Give me a solution to this problem
conversations.from: assistant
conversations.value: The scotch cost $600/10=$60 each
  He bought 10*2=20 bottles of cognac
  Each bottle cost .5*60=$30 more than the scotch
  So they cost $60+$30=$90
  That means he spent $90*20=$1800 on the cognac
  So he spent a total of $600+$1800=$2400