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Listerhill Credit Union is a nonprofit financial cooperative improving lives in our community.

If you live in Alabama, Georgia, Mississippi, Florida, or Tennessee, you are eligible to become a member. Depending on your individual eligibility, we may require membership into an approved association at no cost to you.

You can also qualify for membership by being a family member of a current or potential Listerhill member.

With only $5, you can join Listerhill today and start taking advantage of a lifetime membership.

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Rule of 72 Calculator by Interest Rate

How It Works

The Rule of 72 predicts how long an investment will take to double based on a fixed annual interest rate. The rule is this: 72 divided by the interest rate number equals the number of years for the investment to double in size.

For example, if the interest rate is 12%, you would divide 72 by 12 to get 6. This means that the investment will take about 6 years to double with a 12% fixed annual interest rate. 

Enter a fixed annual interest rate into the calculator to see how long it will take for the investment to double in size.

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Frequently Asked Questions

  • How do tech support scams work?

    Scammers pretend your computer is infected, show fake errors or pop-ups, and convince you to give them remote access or pay for bogus fixes.

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    Yes. Voice-cloned scams frequently imitate family members asking for help with fake emergencies. A safe word system can help prevent this.

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    These callers often spoof official numbers, threaten arrest or fines, and demand immediate payment. Real agencies never call demanding immediate payment via gift card or payment app.

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  • How can I tell if something might be a scam?

    Look for red flags like unexpected requests, urgent threats, unorthodox payment methods (gift cards, wire transfers, cryptocurrency), unfamiliar sender addresses or offers that seem "too good to be true".