Consider the question. John buys a gaming PC for $1200. He decides to replace the video card in it. He sells the old card for $300 and buys a new one for $500. How much money did he spend on his computer, counting the savings from selling the old card?
 If the answer is '1400'; explain the reasoning:
He spent an extra 500 - 300 = $200 on the video card. That means the total cost was 1200 + 200 = $1400.