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@cinmon428 wrote:

Interest follows principal.

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As I said before, exactly.

So if the principal of the loan is composed of 80% Acquisition Debt and 20% credit card debit, then the interest follows that.  So 80% of the interest would be due to Acquisition Debt and 20% of the interest would be due to credit card debt.

So if a $100,000 loan has a 6% rate ($6000 annual), then you are paying 6% on the $80,000 of Acquisition Debt, and 6% on the $20,000 of credit card debt.