The number of copies of the precinct index printed shall be as many as in the judgment of the county elections official may be necessary for the business of the office. In counties where the precinct index is printed by means of a punched card or other high-speed data processing equipment, the number of copies of precinct indexes so prepared shall be the number required to be furnished by law and as many more as in the judgment of the county elections official may be necessary for the business of the office.