Very low in America. We already don't pay teachers enough. Even if a large company with deep pockets (e.g. Google) were to write a check to a state's education

Very low in America. We already don't pay teachers enough. Even if a large company with deep pockets (e.g. Google) were to write a check to a state's education budget (so no other government department took a slice of the tax), the increases would more than likely be caught by inflating administrative costs first for no real increases in teaching others.