answer: #Person2# wants to use the extra money to buy a bike. #Person1# thinks #Person2# needs a new computer instead. #Person2# decides to buy a computer.
documents: #Person1#: Honey, we still have some extra money after buying the TV set last week. If you want to buy something else, you can.
  #Person2#: Well, I need a bike. I don't want to go to work by bus anymore. There are so many people on the bus sometimes that I just can't get on it.
  #Person1#: What do you think of walking to work for exercise? I actually think you need a new computer. Your old one is pretty slow.
  #Person2#: Yes, I do need a computer. Then I will give up on the bike idea. Then I could have $400 to buy a new computer.
  #Person1#: Not just $400. I can give you $100 more than that. If you're going to buy a computer, you should buy a good one.