Question 13 - 15 refer to following conversation: M-Cn: Mina, I was thinking about our travel plans for the industry conference we're going to in Boston. It's only two weeks away. W-Am: Well, the three of us are all taking the same flight, so maybe we could ride together from the office to the airport. But, we'll be gone for several days, so the cost of parking would really add up. M-Cn: True. You know, I think it's twenty dollars to take a taxi. W-Am: That's a possibility. Let's ask Martin ...