Question 1127785
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The $600 interest is a return of 6% on the $10,000 that was invested.<br>
6% is two-thirds of the way from 4% to 7%; that means 2/3 of the money was invested at the higher rate.<br>
The question asks for the amount invested in the CD account, which is the lower rate; 1/3 of the money was invested there.<br>
ANSWER: 1/3 of the $10,000, or $3,333.33, was invested in the CD account.<br>
For a traditional algebraic solution (which will require much more work and take much longer, solve the equation that says amount x invested at 4%, plus (10000-x) invested at 7%, yields $600 interest:<br>
{{{(.04)(x)+(.07)(10000-x) = 600}}}<br>
You can finish the slow algebraic solution.