Michael Bots wrote:
(6% doubles in 10 years  -- 10% doubles in 6 years)

6% doubles in 12 years -- 12% doubles in 6 years

Rule of 72
http://betterexplained.com/articles/the-rule-of-72/
https://en.wikipedia.org/wiki/Rule_of_72

It works for calculating our returns on things like compound interest

It works for calculating our our loss of purchasing power or increase of prices due to inflation.

It works for calculating mortgage payments, interest and term.

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aka Time Value of Money, Compound Interest and some other variations.

This is proven mathematically by the Binomial Theorem
https://en.wikipedia.org/wiki/Binomial_theorem


Einstein - 8th wonder of the world
“Compound interest is the eighth wonder of the world. He who understands it, earns it. He who doesn't, pays it.”

Understanding the profound importance of how this works and how it is applied is one of the most important things we can learn in life. The sooner the better (more incremental periods of doubling or cutting in half before we reach the end of our own personal timeline.)

It's what makes some people multimillionaires with the passage of time and it's what keeps other people destitute for a lifetime no matter how much they work.

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Test Question: How would this apply to the price of gold and silver?