The General Assembly shall be composed of eighty members. Each Senate district to which only one senator is apportioned shall constitute an Assembly district. Each of the remaining Senate districts shall be divided into Assembly districts equal in number to the number of senators apportioned to the Senate district. The Assembly districts shall be composed of contiguous territory, as nearly compact and equal in the number of their inhabitants as possible, and in no event shall each such district contain less than eighty per cent nor more than one hundred twenty per cent of one-fortieth of the total number of inhabitants of the State as reported in the last preceding decennial census of the United States. Unless necessary to meet the foregoing requirements, no county or municipality shall be divided among Assembly districts unless it shall contain more than one-fortieth of the total number of inhabitants of the State, and no county or municipality shall be divided among a number of Assembly districts larger than one plus the whole number obtained by dividing the number of inhabitants in the county or municipality by one-fortieth of the total number of inhabitants of the State.