What are your sources for these numbers? I have not seen these numbers anywhere. Cornell and Penn are not schools you can obtain IS residency at after a year so all tuition costs will be OOS.
Directly from the UPenn website, a non-resident's tuition and required fees is $297,104 and that is just the required expenses. For a resident, it is $257,104 of required billed expenses by the school
UPenn COA (2024-2025). This does not include what the interest would be on these numbers. These are the raw numbers.
For Cornell, the tuition for a non-resident is $64,042 per year (2024-2025), with $660 worth of fees which I am unsure if it is to be paid each year. Assuming it is $660 per year worth of fees, tuition for a non-NY resident is $258,808. For a NY resident, assuming $660 of those fees per year, it is $174, 432
Cornell COA (2024-2025). Once again, the raw numbers.
As for NC State, which DOES allow IS tuition after one year of attendance, IS tuition (2024-2025, raw) is $100,968. I did not see any other mandatory fees in their breakdown but I want to assume there are some there. For non-residents, you would pay one year OOS tuition and then 3 years IS for a total of $133,004 (if you switch your residency). If you would not be interested in gaining residency or domicile in NC, you would pay 4 years OOS tuition which is $226,928. Again, all raw numbers and these don't include any other mandatory fees as they are not outlined on their website
NC State COA (2024-2025).