The other day, we received a letter from Citibank. Their latest missive read, in part, as follows:Dear Ms. Wonk,We are making changes to your account terms.These changes include an increase in the variable APR for purchases to 23.99% and will take effect December 20, 2009.This lastest rate increase comes on top of one that was foisted upon us about six months ago. For years, the interest rate had