The credit card of China Merchants Bank spent 6,255 yuan in March, and repaid 6,225 yuan before the repayment date expired at the end of April. This month's revolving interest reached 117 yuan. How is it calculated? in April, the bill settled the arrears of RMB 6,255. Yuan. If it cannot be repaid in full before the due repayment date of 4.25, the daily interest will be calculated from the consumption date (that is, before 4.7, on a certain day in March) to the repayment date (the specific repayment date, such as 4.25). Because your debt is 6255 before repayment, it is accumulated at 6255x.5% every day. After repayment, the interest will continue to be calculated according to the unpaid part. By the billing date of 5.7, the accumulated interest of 117 yuan includes the interest of 6,255 to 4.25, the interest of these interests to 5.7 (compound interest) and the interest of 3 yuan between 4.25 and 5.7. If you repay the loan on 5.25, there will still be interest between 5.7 and 5.25 (compound interest and the continuation of 3 yuan interest). It is obviously not enough to repay 3+117 according to the bill, and it may not be necessary to repay 3+12. In short, the interest is constantly increasing.

if you don't pay off all the debts at once, even if you only pay back a penny less, that's the same.