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?
O A. (1930)(2052830 20 $0)
OB. 5.30)(50)
O c. (09:16. 30)/20 $0 + 28 0 $2830
O D. (8 19.30 S2830)
30