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$15,000 invested at 3% for 30 years

Future value

$36,409

Interest earned

$21,409

Total growth

142.726%

Investing $15,000 at 3% compounded annually for 30 years grows to $36,409. That's $21,409 of compound interest earned on your original $15,000.

FV = $15,000 × (1 + 3%)^30

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