Where does Mark work?

M: Hello, Campus Daily, advertising department. This is Mark speaking.
W: Hi. I’m calling to place a couple of ads.
M: Sure. Under what classification?
W: Well, I want one in the "Roommate Wanted" section.
M: All right. And how would you like that to read?
W: OK, it should read Female roommate wanted for pleasant, sunny two-bedroom apartment on Eliiewood Avenue, three blocks form campus. Share rent and utilities. Available September 1. Call between 5 and 9 p.m. and ask for Celia.
M: Fine. And what about your other ad?
W: That one I’d like under "Merchandise for Sale", and I’d like it to read "Matching blue and white sofa and easy chair, excellent condition, $ 350 or best offer. Call between 5 and 9 p. m. and ask for Celia." Did you get all that?
M: Uh-huh. You’ll want your phone numbers on these, right?
W: Oh, sure. Thanks for reminding me--it’s 555-6972.
M: And how long do you want these ads to run?
W: For a week, I suppose. How much would that be?
M: It’s five dollars a week per line. Each of your ads will take up three lines, so that’s $ t5 per ad.