If you have an annual interest rate then is 10.405%
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20 YEARS
It is called the rule of 72. You take the interest rate you will be receiving and divide that number into 72. the answer will be the number of years it will take you to double your money at that interest rate.
Approx 69.661 years if the interest is compounded. 100 years otherwise.
There's a rule of thumb for "double your money" problems: Time = 70/interest rate, so in this case approx 7 years.
Yes, that's an accurate number.