conversations.from: human
conversations.value: John and his two brothers decide to split the cost of an apartment.  It is 40% more expensive than John's old apartment which costs $1200 per month.  How much does John save per year by splitting the apartment compared to living alone?
  Find the solution.
conversations.from: assistant
conversations.value: His old apartment cost 1200*12=$14,400 per year
  His new apartment 1200*1.4=$1680 per month
  That means it cost 1680/3=$560 per month
  So it cost 560*12=$6720
  So he saves 14400-6720=$7680