If it's a government college loan, the interest rate is like 5%, and mutual funds are giving more than that right now...so technicallly speaking...I don't know how quick I'd say that
Did you even try to research this yourself? There are many mutual funds that have 20%+ YTD. It's typically recommended to invest before paying off debt like student loans/mortgages because you're likely to make more investing than what you'd save on interest.
You're talking about historical returns of 20% which have little bearing on future returns. (This is finance 101 stuff, let me know if you need a link that explains it to you)
Paying off a 5% interest debt gives a guaranteed return.
Sounds like you're the perfect candidate for the next Bernie Madoff... he guaranteed future returns of >10% on his mutual funds :-)
That said, a (heavily conditioned) case can be made for investing before paying off loans, as I did in my original comment for this thread.)