Explain this to me.....help.

An investment of $82,000 was made by a business club. The investment was split into three parts and lasted for one year. The first part of the investment earned 8% interest, the second 6%, and the third 9%. Total interest from the investments was $6300. The interest from the first investment was 4 times the interest from the second. Find the amounts of the three parts of the investment. What is the amount of the first part of the investment? $ What is the amount of the second part of the investment? $ What is the amount of the third part of the investment? $