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投资：收益率在10-15%, 如何通过投资变得富有
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Satvik Beri, Data Scientist (2010-present)
I’m going to teach you a useful trick called the rule of 72.
Without a calculator, if you invest $100 for 40 years at a 10% interest rate, which of these is closer to how much money you’d end up with?
$500
$1,000
$5,000
$10,000
The answer is 3 – you’ll have made nearly 50x your investment (45.3x to be precise.) And furthermore, there’s an easy way to estimate this in your head: if you have an X% interest rate, then your investment will double approximately every 72/X years. So a 10% interest rate will double about every 7.2 years, while a 12% interest rate will double roughly every 6 years.
That means 40 years is 5–6 doublings at 10%, which gives you somewhere in between 32x and 64x your original investment. Not bad at all!
And that’s how people make money off of returns – a reasonable return, combined with a lot of time, is a pretty good vehicle for significantly increasing your wealth.
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