CCB's credit card has a fixed billing date every month, and 20 days after the billing date is the final repayment date. Before the final repayment date, the consumer will be repaid in full according to the bill amount and enjoy the interest-free period. If you don't repay in full and on time, consumers won't enjoy the interest-free period, and the bank will charge interest in full at the rate of five ten thousandths per day from the date when your consumption is recorded.

If the interest is calculated according to 30 days first, it is 5000*0.0005*30=75. If 1000 is paid in the first month, the interest for the next month will be (5000-1000+75) * 0.0005 * 30 = 61.6543. This is just a rough calculation formula, and it depends on the bills you receive every month.