conversations.from: human
conversations.value: Mike decides to buy a new camera.  He wants to buy a top-of-the-line camera but he decides to wait for the new model to come out.  The new model costs 30% more than the current model.  The old camera cost $4000.  He gets $200 off a $400 lens he bought.  How much did he pay for the camera and lens?
conversations.from: assistant
conversations.value: The new camera cost 4000*.3=$1200 more than the old camera.
  So the camera cost 4000+1200=$5200
  The lens cost 400-200=$200
  So the total cost was 5200+200=$5400