The rhetorical appeal is using a lot of reason because he is bringing a lot of logic towards the piece so his logical cogency is through specified evidence by the numbers.

“Back in the day, a college diploma truly meant something.” pg 402 paragraph 2

there is also a personal appeal where he talks about his time in college and how cheap it was “When I attended Tulane room and board was $2,500 now it is up to $60,000.” pg 403 paragraph 3