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$20,000 invested at 4% for 15 years

Future value

$36,019

Interest earned

$16,019

Total growth

80.0944%

Investing $20,000 at 4% compounded annually for 15 years grows to $36,019. That's $16,019 of compound interest earned on your original $20,000.

FV = $20,000 × (1 + 4%)^15

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