15% interest is 500,000. According to the information in the topic, we can draw the following conclusions:

1.100000 means100000 yuan.

The interest rate is 5%, which is 0.05.

According to the interest calculation formula: interest = principal × interest rate, we can calculate the interest as 6,543,800,000 yuan × 0.05 = 500,000 yuan.

So 15% interest is 500,000.

Summary:

According to the given principal and interest rate, we can use a simple interest calculation formula to calculate interest. In this case, the interest of 15% is 500,000 yuan.

Extended data:

Interest refers to the extra expenses or income generated by the loan principal. Interest rate is a measure of interest, usually expressed as a percentage. According to different interest rate types and interest calculation methods, the calculation method of interest can be different. In the financial field, people often use interest calculation to evaluate the return on investment or loan cost.