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$15,000 invested at 3% for 40 years

Future value

$48,931

Interest earned

$33,931

Total growth

226.204%

Investing $15,000 at 3% compounded annually for 40 years grows to $48,931. That's $33,931 of compound interest earned on your original $15,000.

FV = $15,000 × (1 + 3%)^40

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