Getting 50%

Does getting 50% has anything to do with the amount of buildings? Because it looks like you get more % if there are more hitpoints. This is very important for me because i am pushing using the BARCH strategy. Is it true that if i get 37/73 buildings from a town hall 10 that i have 50%? Or shoud i try to get 30 buildings with alot of hit points?

Hit points gave nothing to do with 50%. You will need 37/73 buildings to win.

Just wipe out all the buildings around the base and a couple on the outer walls.