He's not a new grad, he was a director of PM. He should have a feel for ballpark figures regarding infrastructure and personnel costs, which don't vary by that big a factor from company to company.
The question is perfectly reasonable (and it sounds like the interviewee was providing a reasonable answer). The issue is the way the interviewer ran the interview, not with the particular question itself.
The question is perfectly reasonable (and it sounds like the interviewee was providing a reasonable answer). The issue is the way the interviewer ran the interview, not with the particular question itself.