formulation only please please solve it without using any program

1. In anticipation of the immense college expenses, Mike and Judy started an annual investment program on their child's eighth birthday that will last until the eighteenth birthday. They plan to invest the following amounts at the beginning of each year: 2 Year 1 Amount 2000 2000 3 2500 4 2500 5 3000 6 3500 7 3500 8 4000 9 4000 10 5000 To avoid unpleasant surprises, they want to invest the money safely in the following options: Insured savings with 7.5% annual yield, 6-year government bonds that yield 7.9% and have a current market price equal to 98% of face value, and 9-year municipal bonds yielding 8.5% and having current market price of 1.02 of face value. How should the money be invested to get the maximum return at the child's eighteenth birthday