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interest problem

by romitvsingh » Fri Oct 14, 2011 8:38 am
An investment of d dollars at k percent simple annual interest yields $600 interest over a 2 yr period. In terms of d, what dollar amount invested at the same rate will yield $2,400 interest over a 3 yr period?
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by GMATGuruNY » Fri Oct 14, 2011 9:19 am
I posted a solution here:

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