answer: #Person1# helps #Person2# fill up the car for 250 yuan.
documents: #Person1#: May I help you, sir?
  #Person2#: Fill it up with regular, please.
  #Person1#: Should I take a look at your battery?
  #Person2#: No, thanks. I'm in a hurry.
  #Person1#: Your car is ready.
  #Person2#: Good! How much is it?
  #Person1#: 250 yuan, please!
  #Person2#: That is expensive.
  #Person1#: You should know about the oil crisis.