0.6 percent. Upon inquiry, ABC knows that the installment interest rate of ABC's credit card is 0.6%, and the installment repayment of ABC's credit card has no interest, only the installment fee. The installment fee rate of the bank's credit cards is 0.6% per installment, 1 installment is 1 month. The repayment amount of the cardholder in installments is 1000, divided into six installments, and the total cost is 1000. The credit card overdraft interest rate of ABC is 0.5 ‰ of the daily interest rate, and the approximate annualized interest rate is 18.25%. Overdraft interest is compounded monthly and deducted from the cardholder's account. If the cardholder fails to repay in full before the due repayment date, interest will be calculated from the date when the consumption is recorded to the settlement date, and no interest will be calculated during the interest-free period. The specific interest calculation method may be different due to the cardholder's repayment situation, the number of days in a month and other factors.