exam Maths Puzzle Numerical Ability

You can join the Bestseller Book Club for a membership fee os $100 and then pay $18 for each book you buy. If you buy books from a local bookstore, you can pay $26 for each book. E

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I need help working this problem.
1. A combined total of $20,000 is invested in two bonds that pay 8% and 9.5% simple interest. The annual interest is $1675. How much is invested in each bond?
Solve the following system of linear inequalities by graphing.

x + 2y ≤ 3
2x - 3y ≤ 6