Terry has a credit card that uses the average daily balance method. For the
first 18 days of one of his billing cycles, his balance was $350, and for the last
12 days of the billing cycle, his balance was $520. If his credit card's APR is
14%, which of these expressions could be used to calculate the amount Terry
was charged in interest for the billing cycle?

A 31) (12 • $350418 $520)
B. (.0) (120 $350 + 180 $520
c. 14. 31) (18 • $350 47120 8520
D. (04.30) 18 •$350 * 120 620