% of Area inside an Area

Hi there,
How it’s the best and faster way to achieve that?
I want to know the % of element area inside another area?

Thanks in advance

I’m attaching the dyn file.

By the way, this method would keep to much memory if i have more than 500 spaces?

All of this is in order to know the influence area of a electrical equipment.Areas Mass.dyn (11.1 KB)

A division node perhaps?