No license shall be issued to any per­son for the sale at retail of any alco­holic liquor at any store or oth­er place of busi­ness where the major­i­ty of cus­tomers are minors of school age or where the prin­ci­pal busi­ness trans­act­ed con­sists of school books, school sup­plies, food, lunch­es, or drinks for such minors. (See 235 ILCS 5/6–12)