The interest rate of credit card interest is generally five ten thousandths of the bank interest rate, and it can also be fifteen thousand a day. It seems low, but it is by no means a decimal.

When five ten thousandths of the daily interest rate is converted into the annual interest rate, it is 0.0005*360=0. 18, which is the annual interest rate 18%, which is similar to the folk usury.

Usually, banks will compound interest on credit cards on a monthly basis, that is, add up the principal interest of last month and then calculate the interest of next month. Accumulate in this way