M: Do you rent rooms by the week? You see, I'm not sure whether we will stay for a whole month. W: Well, it's 30 dollars a week, plus 10 dollars for electricity, but only 130 dollars a month inclusive., Question: How much will the room cost for one month including electricity? (A) $ 140. (B) $ 120. (C) $ 130.
(C) $ 130.