how can i control my Credit Card APR

Submitted by Anonymous on Wed, 07/29/2009 - 18:36.
I just eceived a letter from my Merrick Bank credit card telling me they're going to change my APR from a 22.90% to 35% effective 7/31/2009, due to a recent review of my credit. I could not believe my eyes when I saw it. My credit limit is $750 & my current balance is $720 because of a recent emergency expense that I used it for. Can anyone tell me what my options may be with this situation? Your suggestions will surely be appreciated.
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