Rank Points don't add together. To find how many rank points you will recieve by finding the difference from one level to another. When you upgrade from Level 9 to Level 10, you get 75 points for that upgrade. 300-225=75.

Maybe good idea to have this page http://lordofultima.wikia.com/wiki/Buildings-categorized linked on the start page? Somewhat hard to find.

And another thought... I think it would be better to not show the added score from the previous levels only the score for that level upgrade. Would be more easy to read.