<prompt> Human: Throwaway because I dont want any of my financial information attached to my usual username.I have 16k in student debt and my school sent me about a 7k refund check. Of course, I immeditely thought to send the money to Greatlakes in order to lower the interest and principle. However, I was looking at the way interest is calculated and it appears that my gut reaction is wrong.This Link indicates that they incorperate the last date of payment when calculating the month to month loan. If I were to apply the 7k today, I could be looking at a multiplier of 125 days, which might be hazerdous. Especially when Im still in the 1.25 interest rate for my grace period. What should I do? At this point, Im thinking of taking the 7k and saving it until the day my grace period ends. There is some possibility that I would invest it to try and make more before November, but with Bernanke possibly pulling QE in August, I might wait until then.Thanks dudes.  <response>: Call them. Ask. We dont know the terms of your loan, so were only guessing. 