The loan interest is determined according to the interest rate and the loan term. According to the information provided, we assume that the loan interest rate is 5% per year (this assumption is only used to answer questions, and the actual interest rate needs to be negotiated with the bank according to the specific situation), and the loan period is one year.

Based on the above assumptions, the loan interest is calculated as follows:

Interest = loan amount × annual interest rate

= 10000 × 0.05

= 500 yuan

So the annual interest on a loan of 10,000 yuan is 500 yuan.

Summary:

Assuming that the annual interest rate is 5% and the loan amount is 6,543,800 yuan, the interest of the loan for one year is 500 yuan. Please note that this is only an example, and the actual interest rate and loan amount may be different. In practice, please negotiate with the lending institution to determine the accurate interest rate and repayment method.

Extended data:

1. According to the laws of China, the loan interest rate is usually set by the People's Bank of China and adjusted according to market changes.

2. When making a loan, you should also consider other expenses, such as handling fees and insurance premiums, which may affect the actual cost of the loan.

3. The loan interest rate is usually different according to the borrower's credit status and loan term, and the interest rate may be different for different individuals or enterprises.