Posted by **Diana** on Wednesday, July 11, 2007 at 10:45pm.

Kevin earned $165 interest for 1 year on an investment of $1500. At the same rate, what amount of interest would be earned by an investment of $2500?

At the same rate of interest, and period, the interest earned will be proprtional to the original principle. Therefore, you can multiply $165 by 2500/1500 (or 5/3) to get the answer.

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