I'm doing a statistics work for school and there is a value that is 4.15% bigger than it should. In order to get the original value I use the rule of three , counting the given value as 104.15%, to get the 'corrected' 100%. The problem is that if I use the rule of three counting the given value as 100% and then trying to get the corrected value as the 95,85% (100-4.15) is doesn't throw the same result. why?
104.15%--------14.973833431
100%------------14.37718044
and then
100%-----------14.973833431
95.85%--------14.35241934
why is it not the same? thanks
That's because $\frac{100}{100+x}$ is not the same as $\frac{100-x}{100}$.