The rule of 72 the most important and simple rule to financial success
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The Rule of 72 The most important and simple rule to financial success. Rule of 72. The answers can be easily discovered by knowing the Rule of 72 The time it will take an investment (or debt) to double in value at a given interest rate using compounding interest.

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The Rule of 72 The most important and simple rule to financial success.

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The rule of 72 the most important and simple rule to financial success

The Rule of 72The most important and simple rule to financial success.


Rule of 72

Rule of 72

  • The answers can be easily discovered by knowing the Rule of 72

    • The time it will take an investment (or debt) to double in value at a given interest rate using compounding interest.


What the rule of 72 can determine

What the “Rule of 72” can determine

  • How many years it will take an investment to double at a given interest rate using compounding interest.

  • How long it will take debt to double if no payments are made.

  • The interest rate an investment must earn to double within a specific time period.

  • How many times money (or debt) will double in a specific time period.


Things to know about the rule of 72

Things to Know about the “Rule of 72”

The “Rule of 72”

  • Is only an approximation

  • The interest rate must remain constant

  • The equation does not allow for additional payments to be made to the original amount

  • Interest earned is reinvested

  • Tax deductions are not included within the equation


Doug s certificate of deposit

Doug’s Certificate of Deposit

  • Invested $2,500

  • Interest Rate is 6.5%

Doug invested $2,500 into a Certificate of Deposit earning a 6.5% interest rate. How long will it take Doug’s investment to double?


Another example

Another Example

The average stock market return

since 1926 has been 11%

Therefore, every 6.5 years an individual’s investment in the stock market has doubled


Jessica s credit card debt

Jessica’s Credit Card Debt

  • $2,200 balance on credit card

  • 18% interest rate

Jessica has a $2,200 balance on her credit card with an 18% interest rate. If Jessica chooses to not make any payments and does not receive late charges, how long will it take for her balance to double?


Another example1

Another Example

  • $6,000 balance on credit card

  • 22% interest rate


Jacob s car

Jacob’s Car

  • $5,000 to invest

  • Wants investment to double in 4 years

Jacob currently has $5,000 to invest in a car after graduation in 4 years. What interest rate is required for him to double his investment?


Another example2

Another Example

  • $3,000 to invest

  • Wants investment to double in 10 years


Rhonda s treasury note

Rhonda’s Treasury Note

Rhonda is 22 years old and would like to invest $2,500 into a U.S. Treasury Note earning 7.5% interest. How many times will Rhonda’s investment double before she withdraws it at age 70?


Another example3

Another Example

  • $500 invested at age 18

  • 7% interest

  • How many times will investment double before age 65?


Conclusion

Conclusion

  • The Rule of 72 can tell a person:

    • How many years it will take an investment to double at a given interest rate using compounding interest;

    • How long it will take debt to double if no payments are made;

    • The interest rate an investment must earn to double within a specific time period;

    • How many times money (or debt) will double in a specific time period.


Conclusion continued

Conclusion continued

  • Things individuals must remember about the Rule of 72 include:

    • Is only an approximation

    • The interest rate must remain constant

    • The equation does not allow for additional payments to be made to the original amount

    • Interest earned is reinvested

    • Tax deductions are not included within the equation


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