The annual interest rate of100000 loan is 5%, which means that you need to pay 500000 interest every year. This is because the interest rate is the percentage of the loan principal, calculated on an annual basis, so the interest calculated at 5% is 6,543,800+million, multiplied by 5% (that is, 0.05) to get 500,000 yuan.

Detailed description:

1. The loan principal is100000, and the interest rate is 5%, which means that 5% of the loan principal needs to be paid as interest every year.

2. The calculation of interest is based on the result of multiplying the loan principal by the interest rate.

3. The loan is 6,543,800 yuan, and the interest of 5% is 6,543,800 yuan multiplied by 5% (0.05), which is equal to 500,000 yuan.

Extended data:

-In practice, loans may also involve other expenses, such as handling fees and insurance premiums.

-Interest rates may fluctuate according to market conditions and the borrower's credit rating.

-The repayment method will also affect the calculation of interest. Common repayment methods include equal principal and interest and average capital.

The above calculation is based on the assumption that there are no other expenses or special repayment methods. The calculation of specific loan interest should follow relevant laws and agreements. Please consult a professional for accurate loan interest information.