Carla has a credit card that uses the average daily balance method. For the first 15 days of a 31-day billing cycle, her balance was $2560, but then she paid off her entire balance and didn't make any new purchases. If her credit card's APR is 28%, how much was Carla charged in interest for the billing cycle?
A.$29.46
B.$31.42
C.$60.88
D.$0
A.$29.46
B.$31.42
C.$60.88
D.$0