conversations.from: human
conversations.value: Tom opens an amusement park.  It cost $100,000 to open initially.  It also cost 1% of that to run per day.  He sells 150  tickets a day for $10 each.  How long will it take to make back his money?
  Can you solve this problem?
conversations.from: assistant
conversations.value: It cost 100,000*.01=$1,000 a day to keep the place open
  He makes 150*10=$1500 a day from the park
  So he makes a profit of 1500-1000=$500 a day
  So it takes 100000/500=200 days to make back his money