SOLUTION: clay is going to invest 9000$, part at 3% and the rest at 3.5%. what is the most he can invest at 3% and still be guaranteed 300$ interest each year

SOLUTION: clay is going to invest 9000$, part at 3% and the rest at 3.5%. what is the most he can invest at 3% and still be guaranteed 300$ interest each year

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Question 848245: clay is going to invest 9000$, part at 3% and the rest at 3.5%. what is the most he can invest at 3% and still be guaranteed 300$ interest each year
Answer by swincher4391(1107) (Show Source): You can put this solution on YOUR website!
Let x be the amount invested at 3% and (9000-x) be the part invested 3.5%.
.03x + .035(9000-x) >= 300
.3x + 315 - .035x >= 300
-.005x >= -15
x <= 3000
Which means he can put at most $3000 in the 3% to guarantee the return of $300.
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