Based on the information given, it can be deduced that the annual percentage rate (APR) is 24%.
The annual percentage rate simply means the yearly interest that's generated by a sum that's charged to a borrower. In this case, the APR is 24% after 6 months.
Also, the credit cards that have an annual fee will be credit card 2 and 3. It can also be deduced that the grace period is the same for the three credit cards while credit 3 has a membership.
If one pays the credit card bill on time and the balance each month, the best credit card is credit card 1. Lastly, when one has a balance from time to time credit card 1 is still the best.
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