Mental Math: Years to Double an Investment

Sharing a very simple, but handy mental math rule that was mentioned in quite a few of our MBA classes, such as Investment Styles and Strategies, Designing Financial Models that Work and others:

If you want to quickly ballpark the # of years it will approximately take for an investment to double, then just divide 72 by the annual growth rate. For example, if your investment grows 7% a year, it will take slightly more than 10 years for it to double (72/7). But if it grows 36% a year, it will only take about two years to double (72/36). 

You can read more about this “Rule of 72” on Wikipedia. Now, you now you can come across as a math genius without much effort 😉

Magic shortcuts: 13 best chrome custom searches that will save you lots of time

As you may already know, Google Chrome has an amazing feature that let’s you edit search engines. And search engine means literally any website. What’s the practical application?

Well, if you type something like “great blog” and press enter, by default you’ll be redirected to Google. But you can set up your Chrome to use, let’s say, Yahoo when you type “y great blog” or Bing when you type “b great blog”. Sounds like a great life-hack and a time-saver, doesn’t it? So, instead of going to the other website you just add one letter before the query itself and Chrome uses the other search engine to find what you need.

First, you’ll need to know how to add a new search engine, I won’t go into details as there are a lot of tutorials on web at the moment.

I’m sure you can come up with lost of ideas on how to use this feature yourself, but let me sparkle your imagination a little with my own list of searches. Here is what I use and consider to be the most useful:

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