College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter P, Prerequisites - Chapter P Review - Exercises - Page 78: 132

Answer

$\$9600$

Work Step by Step

Let $x$ be the amount she invested additionally. Then the sum of the interest gained after investing $6000$ at $3\%$ and $x$ at $1.25\%$ is $300$. Then our equation is: $6000\cdot0.03+0.0125x=300\\0.0125x=120\\x=\$9600$
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