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Just to throw some more math your way, if you have the amount of money you started with, the amount of money you ended up with, and the number of years in between, you can find your average annualized return by:

1 - ((starting value/ending value)^1/number of years)

So if you started with $10,000, and in 10 years you ended up with $100,000, your average annualized return would be:

1 - (($100,000/$10,000)^1/10) = 25.9%

If you look, this is just the formula for compound growth rearranged a bit. In this case you want to find the rate of return instead of the amount you end up with.

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