ACT vs SAT at Penn????

<p>So spring of junior year I took the SAT and some SAT IIs...did alright but I took the ACT this fall and did a lot better. Since Penn doesn't make you submit SAT II's with the ACT, can I just submit the one ACT test or do I have to submit the SAT as well? I don't know if anyone else agrees but I think they are a little vague with this on the website.</p>