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For example yesterday I had 886 dollars. But today I have only 877 dollars. How can I calculate how much richer am I today than yesterday in percents ( so number of percents should be with "-" ).

How can I calculate it?

I have to do this in many ways, but unfortunately i can't get the right result.

Thanks.

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Have you tried ${t\over y}-1$? $t$ is today, $y$ is yesterday. –  abiessu Sep 27 '13 at 16:44
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No offense ... but by your given amounts, you're becoming poorer not richer than yesterday –  user67258 Sep 27 '13 at 16:58
    
so number of percents should be with "-" (from my question) –  Michael Vayvala Sep 27 '13 at 17:59
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1 Answer

up vote 6 down vote accepted

Let $x_0$ be your initial amount of money, and $x_1$ be your new amount. The percent increase is calculated as follows:

$$\frac{x_1-x_0}{x_0}\cdot{100\%}$$

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