conversations.from: human
conversations.value: John decides to install a ramp in his house.  He needs to get permits which cost $250.  After that, he hires a contractor which costs $150 an hour and the guy works for 3 days at 5 hours per day.  He also pays an inspector 80% less to make sure it is OK.  How much was the total cost?
  Find the solution.
conversations.from: assistant
conversations.value: The contractor works for 3*5=15 hours
  That means he charged 150*15=$2250
  The inspector charged 2250*.8=$1800 less
  So the inspector charged 2250-1800=$450
  So the total amount charged was 250+450+2250=$2950