A business club invested $70,000 which was split into three parts for one year. The first part earned 8% interest, the second 6% interest, and the third 9% interest. The total interest earned was $20. The interest from the first part was twice that of the second part. Solving the equations given the rates, amounts, and total interest shows: 1) The amount of the first part of the investment was $30,000. 2) The amount of the second part of the investment was $20,000. 3) The amount of the third part of the investment was $20,000.