When talking about a starting value and a new value, I find the percentage change formula on the page you referenced to be the most logical. When considering a

When talking about a starting value and a new value, I find the percentage change formula on the page you referenced to be the most logical. When considering a change, your frame of reference is usually the original value. http://en.wikipedia.org/wiki/Relative_change_and_difference#Percentage_change http://en.wikipedia.org/wiki/Relative_change_and_difference#...