What is a credit card balance?
these are the answers
a) the amount of interest you must pay the credit card company
b) the required minimum payment to your credit card company
c) a way to track your incoming and outgoing purchases
d) the amount of money you still owe to the credit card company

Credit card balance is the amount of money you owe to the credit card company and it's dependent of your purchases, unpaid balnces and any other fees. If you owe money this balance is positive number. If you paid more money than you owe the balance is negative number and zero if the balance is fully paid.

where is this problem from?

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