The total interest for the CCB credit card of 600 yuan to be repaid in three installments is 12.6 yuan.
The installment rate of CCB credit card is:
The interest of CCB credit card of 600 yuan in three installments: the total interest is 12.6 yuan, and the interest needs to be paid off in one go, so the first repayment is required 212.6 yuan, calculated as follows: