1. The smart card interest rate of China Merchants Bank is 0.05% or 0.05%, and interest is charged on a daily basis. However, if the generated interest is not returned in time in the current month, it will be included in the next bill every month to calculate compound interest, that is, rolling interest.

2. The smart card of China Merchants Bank will not generate interest if it is repaid in full before the final repayment date. If it is not fully paid off, the minimum repayment amount can be paid first, which is generally 10% of the total repayment amount, and the interest on the remaining unpaid amount is calculated at the daily interest rate of 0.05%, which is about 18% for the whole year.