Make Today Count Rule of 72

Start today! Take action because ...The Rule of 72 is Cool! When people invest money, they do it so they can make money. That’s called "getting a return on your investment.” Sometimes they want to know how long it will take to double their investment. To do this, we use the Rule of 72.

Take 72 and divide it by the amount of return on your investment. That is the number of years it will take to double your original investment.

For example: Ten year-old Keanu buys a bond for $10,000 and earns 6%. 72 divided by 6 = 12. So every 12 years, Keanu’s money doubles. When he is 22, he will have $20,000.

What if Keanu leaves that money alone until he retires at 60 years old? His money will double 4 times by then and he will have $160,000.

Let’s say Keanu used that original $10,000 and bought a stock that earns 12% return (72 divided by 12 = 6) he will have $20,000 in 6 years when he is 16. If he leaves that money alone until he retires, it will double 8 times and he will have over $2.5 million when he is 60 years old.

The Rule of 72 is based on a principle called “compound interest” (return), which is sometimes called “The 8th Wonder of the World”!

Go Team!  Brett Ellen, The Kids Finance Coach

The Rule of 72 is Cool

When people invest money, they do it so they can make money. That’s called "getting a return on your investment.” Sometimes they want to know how long it will take to double their investment. To do this, we use the Rule of 72.

Take 72 and divide it by the amount of return on your investment. That is the number of years it will take to double your original investment.

For example: Ten year-old Keanu buys a bond for $10,000 and earns 6%. 72 divided by 6 = 12. So every 12 years, Keanu’s money doubles. When he is 22, he will have $20,000.

What if Keanu leaves that money alone until he retires at 60 years old? His money will double 4 times by then and he will have $160,000.

Let’s say Keanu used that original $10,000 and bought a stock that earns 12% return (72 divided by 12 = 6) he will have $20,000 in 6 years when he is 16. If he leaves that money alone until he retires, it will double 8 times and he will have over $2.5 million when he is 60 years old.

The Rule of 72 is based on a principle called “compound interest” (return), which is sometimes called “The 8th Wonder of the World”! In other words its really cool.

Here’s something VERY important to remember. Just because things happened in the past, doesn’t guarantee they’ll happen in the future. So we use historical return rates as an example. It doesn’t mean that if you invest in the stock market today, that you will receive 12% return on your investment every year. Also, when investing in stocks it is possible to lose money, so that the value of the stock could be less than the original investment.

 

So my message is ... start learning about how to invest your money wisely now.

Make Today Count

Start today!  Take action because ...
The Rule of 72 is Cool!  When people invest money, they do it so they can make money. That’s called "getting a return on your investment.” Sometimes they want to know how long it will take to double their investment. To do this, we use the Rule of 72.

Take 72 and divide it by the amount of return on your investment. That is the number of years it will take to double your original investment.

For example: Ten year-old Keanu buys a bond for $10,000 and earns 6%. 72 divided by 6 = 12. So every 12 years, Keanu’s money doubles. When he is 22, he will have $20,000.

What if Keanu leaves that money alone until he retires at 60 years old? His money will double 4 times by then and he will have $160,000.

Let’s say Keanu used that original $10,000 and bought a stock that earns 12% return (72 divided by 12 = 6) he will have $20,000 in 6 years when he is 16. If he leaves that money alone until he retires, it will double 8 times and he will have over $2.5 million when he is 60 years old.

The Rule of 72 is based on a principle called “compound interest” (return), which is sometimes called “The 8th Wonder of the World”! I’ll explain more about compound return in my next post.

Here’s something VERY important to remember. Just because things happened in the past, doesn’t guarantee they’ll happen in the future. So we use historical return rates as an example. It doesn’t mean that if you invest in the stock market today, that you will receive 12% return on your investment every year. Also, when investing in stocks it is possible to lose money, so that the value of the stock could be less than the original investment.

What is Compound Interest?

There are two kinds of interest – simple interest and compound interest. You probably know how simple interest works.

For example: If I have $10,000 and I earn 6% interest, how much money do I earn after one year?
Answer: $600

If I earned 6% every year for 12 years how much money would I have earned in interest?
Answer: $600 per year x 12 years = $7200. So adding that to my initial investment, I’d have a total of $17,200

Compounding Interest
If I have $10,000 and I earn 6% compounding interest, how much money do I earn in interest?

Answer: Well, if I apply the “Rule of 72” (which we discussed in our last post) 72 divided by 6 (the rate of interest) = 12. That means my total money will double in 12 years to $20,000.

So why is the total amount of money higher with compounding interest than with simple interest ($20,000 compared with $17,200) if they both receive 6% interest?
Answer: With simple interest I earn the same amount of interest each year on the original $10,000. So every year I only receive $600. With compounding interest, I add $600 (interest) to my original $10,000. Then the next year I earn 6% on $10,600 which is $636. When added together I have $11,236. The following year I earn 6% on that amount

End of year 1 - $600 + $10,000 = $10,600
End of year 2 – 6% x $10,600 = $636. $636 + $10,600 = $11,236
End of year 3 – 6% x $11,236 - $674.16. $647.16 + $11,236 = $11,883.16
End of year 4 – 6% x $11,883.16 - $712.99. $712.99 + $11,883.16 = $12,596.15
End of year 5 – 6% x $12.596.15 - $755.77. $744.77 + $12.596.15 = $13,391.92

Do you see how this is calculated? Dan you continue to do the math?