No research on this, but I don't recall any tolerance. My concern would be what was disclosed in the contract, what was calculated on your system, why would they be different and the real kicker, what effect has this had on your finance charge calculations?
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AndyZ CRCM
My opinions are not necessarily my employers.
R+R-R=R+R
Rules and Regs minus Relationships equals Resentment and Rebellion. John Maxwell