Usually when you have a credit card, if you pay off the full balance each month,how much interest do you owe?

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You owe no interest if you pay off the balance in full before the payment is due. The credit card companies have a strong incentive to offer you to pay the smallest payment possible so they can stretch the repayment period over the longest time possible. This yields the most interest and highest return for the company. 

The answer is A because it doesn’t have a negative sign :)