The annual percentage rate (APR) on your credit card is 17.8% (monthly compounded). During the first week of school, you racked up $500 in credit card debt. You do not have access to a cheaper source of financing, and you definitely do not want to tell y our parents, so you decided that you will pay it all back in $80 equal monthly installments. Your first payment is due today . How long will it take to bring your credit card balance to zero?

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