SOLUTION: A mother wants to invest $9000 for her children's education. She invests a portion of the money in a bank certificate of deposit(CD account)which earns 4% and the remainder in a sa

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Question 561492: A mother wants to invest $9000 for her children's education. She invests a portion of the money in a bank certificate of deposit(CD account)which earns 4% and the remainder in a savings bond that earns 7%. If the total interest after one year is $540, how much money was in each rate?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = amount invested in CD
+.04x+ = interest from CD
+.07%2A%28+9000+-+x+%29+ = interest from savings bond
given:
+.04x+%2B+.07%2A%28+9000+-+x+%29+=+540+
+.04x+%2B+630+-+.07x+=+540+
+-.03x+=+-90+
+.03x+=+90+
+x+=+3000+
+9000+-+x+=+9000+-+3000+
+9000+-+x+=+6000+
$3,000 was invested in the CD
$6,000 was invested in savings bond