conversations.from: human
conversations.value: John decides to get a new apartment with a roommate.  His former rent was $2 per square foot for a 750 square foot apartment.  His new apartment cost $2800 per month, which he splits evenly with the roommate.  How much money does he save a year?
  Solve this problem.
conversations.from: assistant
conversations.value: His old apartment cost 750*$2=$1500 a month
  His new apartment cost $2800/2=$1400 a month
  So he saves $1500-$1400=$100 a month
  That means he saves $100*12=$1200 a year