answer: #Person1# wants to rent rooms by the week but #Person2# tells #Person1# it's economical to rent by the month.
documents: #Person1#: Do you rent rooms by the week? You see, I'm not sure whether we will stay for a whole month.
  #Person2#: Well, it's 30 dollars a week, plus 10 dollars for electricity, but only 130 dollars a month inclusive.