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$15,000 invested at 10% for 40 years

Future value

$678,889

Interest earned

$663,889

Total growth

4,425.93%

Investing $15,000 at 10% compounded annually for 40 years grows to $678,889. That's $663,889 of compound interest earned on your original $15,000.

FV = $15,000 × (1 + 10%)^40

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