Shirley has a credit card that uses the previous balance method. The opening
balance of one of her 30-day billing cycles was $2830, but that was her
balance for only the first 2 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 19%, which of these expressions could be used to calculate the
amount Shirley was charged in interest for the billing cycle?
. $0 +28. $2830
B
(0.19
(365
O A. (69• 30)80)
O B. 649.30 20$0 +28 • $2830
O c. (:30) (2•$2830
O D. (1930)82330)