conversations.from: human
conversations.value: James can buy a new computer for $600 and have it last 6 years, or buy 2 used computers for $200 each that each last 3 years. How much money will he save by picking the cheaper option?
  Can you solve this problem?
conversations.from: assistant
conversations.value: First find the cost of the two used computers: $200/computer * 2 computers = $400
  Then subtract that cost from the cost of the new computer to find the savings: $600 - $400 = $200