Stop 
OK - Stop. There is no policy stating that simple arithmetic calculations, including percentages, are forbidden. Such calculations done for clarity, consistency and/or comparison purposes are perfectly valid, such do not fall under WP:OR. Of course the calculated figures are no better than the numbers they are based on and care must be taken to avoid any such implication. A simple example is the calculation and addition of metric units when measurements are given in a non-metric system (here care must be taken to avoid changing the precision of the measure). So, do the calculations and add the percentages and violetriga won't revert without a specific and clear policy. Meanwhile, Fill - your comments are getting quite pointy, please tone it down a bit. On with improving the article and quit the qubbling.