Joan has a credit card that uses the previous balance method. The opening balance of one of her 30-d

Описание: Joan has a credit card that uses the previous balance method. The openingbalance of one of her 30-day billing cycles was $\$ 6390$ but that was herbalance for only the first 3 days of the billing cycle, because she then paid offher entire balance and didn't make any new purchases. If her credit card'sAPR is $17\% $ which of these expressions could be used to calculate theamount Joan was charged in interest for the billing cycle?A. $(\frac {0.17}{365}\cdot 30)(\$ 6390)$B. $(\frac {0.17}{365}\cdot 30)(\frac {3\cdot \$ 6390+27\cdot \$ 0}{30})$C. $(\frac {0.17}{365}\cdot 30)(\frac {3\cdot \$ 0+27\cdot \$ 6390}{30})$D. $(\frac {0.17}{365}\cdot 30)(\$ 0)$
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