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.


  • 1
    $\begingroup$ Have you tried ${t\over y}-1$? $t$ is today, $y$ is yesterday. $\endgroup$
    – abiessu
    Sep 27, 2013 at 16:44
  • 2
    $\begingroup$ No offense ... but by your given amounts, you're becoming poorer not richer than yesterday $\endgroup$
    – user67258
    Sep 27, 2013 at 16:58
  • $\begingroup$ so number of percents should be with "-" (from my question) $\endgroup$
    – Michael
    Sep 27, 2013 at 17:59

1 Answer 1


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



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