answer: #Person2# tells #Person1# #Person2# fell down fifty times when practicing windsurfing and the rent was fifty dollars for a half-hour. #Person1# thinks it's worth the rent.
documents: #Person1#: Hectic. It's always hectic. But how was your windsurfing?
  #Person2#: I tried it for a half-hour. It was interesting, but. . . well. . . I couldn't really do it.
  #Person1#: See? I told you. It's very hard.
  #Person2#: I couldn't even stand on it and hold the sail. I probably fell down fifty times.
  #Person1#: Fifty times?
  #Person2#: Yes, it was really stupid.
  #Person1#: And how much did it cost to rent it?
  #Person2#: It was fifty dollars for a half-hour.
  #Person1#: Well, that's not too bad then.
  #Person2#: What do you mean? It's expensive!
  #Person1#: Yes, but you have to calculate a little. You paid fifty dollars and you fell down fifty times. So you only spent one dollar per fall. That's cheap.