SOLUTION: Annie made a real estate investment that earned 7.5% annual simple interest. She made a second investment that was half the amount of the first and earned 9% interest. The total

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Question 286374: Annie made a real estate investment that earned 7.5% annual simple interest. She made a second investment that was half the amount of the first and earned 9% interest. The total amount of interest earned was $900. how much did annie invest in the second investment
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
.075*2x+.09x=900
.15x+.09x=900
.24x=900
x=900/.24
x=3,750 amount of the 9% investment.
2*3,750=7,500 amount invested @ 7.5%.
Proof:
.075*7,500+.09*3,750=900
562.50+337.50=900
900=900