Irene has a credit card that uses the previous balance method. The opening
balance of one of her 30-day billing cycles was $2510, but that was her
balance for only the first 5 days of the billing cycle, because she then paid off
her entire balance and didn't make any new purchases. If her credit card's
APR is 11%, which of these expressions could be used to calculate the
amount Irene was charged in interest for the billing cycle?
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Home » Mathematics » Irene has a credit card that uses the previous balance method. The opening balance of one of her 30-day billing cycles was $2510, but that was her balance for only the first 5 days of the billing cycle, because she then paid off her entire balance