conversations.from: human
conversations.value: Tom charges a fee of $100 a day to search for an item for the first 5 days and then $60 per day for every day after that.  How much did it cost for him to look for an item for 10 days?
conversations.from: assistant
conversations.value: The first 5 days cost 5*100=$500
  He gets 10-5=5 days on discount
  He paid 5*60=$300 at the discounted rate
  So in total he pays 500+300=$800