# Blowing Your Mind with the Rule of 72

Numbers have a way of surprising you sometimes. Add a bit of time to them and they can blow your mind. Take for instance the Rule of 72. This is a formula to determine how long it takes for money to double depending on a certain interest rate. For example, with an interest rate of 10%, your money doubles in 7.2 years. 72/Interest Rate = Your money x 2. Just think about that. So if you have \$250,000 in 7.2 years you could have \$500,000 with a 10% interest rate. So what about 10 years later? Yep.... \$1,000,000. That is pretty incredible. Now, I am not going to say that you will get 10% for 20 years, but even if you bring that down to 5%, you could still have a cool million well within your lifetime. This magical wealth machine is powered by compounding interest. You are essentially making money from the returns that you earned previously... and it doesn't stop. If you don't touch the money it will just keep growing... and growing... and growing.