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Person A (credit card holder) should pay the interest.
Even though Person B had an obligation to pay before a proscribed period of time, Person A did not foresee nor contract with Person B regarding the payment of interest in the event of default. Therefore, it was Person A's responsibility to insure that no interest would be accrued, even if it meant paying Person B's debt, and seeking repayment after the allotted time. Failure to do so on Person A's part amounts to a breach of the credit card agreement he has with the Credit Card Company, regardless of who should have paid.
My answer above is purely rational, and doesn't account for the fact that it sucks that Person B totally di*ked over Person A. Person A should be more carefully in the future not to bind themselves to irresponsible people who will cause them to incur unnecessary debt on their behalf.
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