Background Info on Square Roots and Percentage
These are the links I found on the internet best explaining what Square Roots are :
http://www.purplemath.com/modules/radicals.htm
These are the links i found on the internet best explaining how to find percentage :
http://www.mathgoodies.com/lessons/toc_vol4.html
http://en.wikipedia.org/wiki/Percentage
By Allan Pasco and Tony Dao