conversations.from: human
conversations.value: Break down this math problem: John commissions an artist to make him a 9 by 13 drawing.  A black and white drawing that size would cost $160.  He wants a color drawing so that is 50% more expensive.  How much did he pay?
conversations.from: assistant
conversations.value: The extra cost for coloring is 160*.5=$80
  So the total cost was 160+80=$240