You're not talking about interest, you're talking about handling fees. Because credit cards are handled in installments, after each month's installment, the repayment date is 20 days after the bill date. You pay the bill in full before the final repayment date. Like consumption, enjoy an interest-free period, that is, no interest is charged. On the other hand, if the repayment is not made in full and on time, interest will be charged in full at the rate of five ten thousandths every day from the date of entry, just like consumption.

If you mean the installment of CCB's consumption, you apply for the installment of your single consumption 1000 yuan two days before the bill date, which is a one-by-one application. The handling fee for the third phase is 0.7% and the handling fee for the sixth phase is 0.6%. If 1500 is divided into three installments, the installment principal of each installment is 1500/3=500, the installment fee of each installment is 1500*0.7%= 10.5, and the total fee of the three installments is10. This will be shown on your bill.