Percentages not adding up I have a series of percentages:
132/220 (60%) and 88/220 (40%).
Now when I break them down into subcategories and then recalculate the percentages them come out 5% different.
81/140 (58%) and 59/140 (42%) (percentages ROUNDED).
21/40 (52.5%) and 19/40 (47.5%).
14/20 (70%) and  6/20 (30%).
16/20 (80%) and 4/20 (20%).
then we I do the averages I get:
65.125% and 34.875%
I have no idea what is happening???

You seem to be suggesting that $\frac{132}{220} = \frac{81}{140} + \frac{21}{40} + \frac{14}{20} + \frac{16}{20}$. This is not true. The simplest example, $\frac{4}{6}$ is not equal to $\frac{3}{5}+\frac{1}{1}=1.6$.
