Mongolian businessmen's bank cards and credit cards have not paid such high full interest.

There may be the following reasons for the high interest rate of credit cards in Shang Meng Bank:

1. interest rate level: different banks may have different credit card interest rates. If the Bank of Shang Meng sets a higher interest rate, the unpaid full interest rate may be correspondingly higher.

2. Overdue interest rate: The interest rate of overdue credit cards is usually higher than the normal interest rate. If the cardholder fails to repay the loan on time, Mongolian commercial bank may calculate the interest according to the overdue interest rate, resulting in higher interest on the unpaid amount.

3. Calculation method of outstanding full interest: The calculation method of outstanding full interest of different banks may be different. The Bank of Shang Meng may have adopted a higher calculation method, resulting in a higher interest rate on the outstanding amount.

4. Other fees: In addition to interest, credit cards will also charge other fees, such as annual fees and cash withdrawal fees. If other fees of Shang Meng Bank are relatively high, the unpaid interest may increase.

It should be noted that the above are some possible reasons, and the specific situation may need to be determined according to the relevant policies of Mongolian commercial banks and credit card contracts. If you are in doubt about the specific interest charges, it is recommended to consult the customer service of Mongolia Commercial Bank or read the credit card agreement.