Ошибка - js invalid or unexpected token

function calc() { 
    var roi1 = $('.roi1'); 
    var roi2 = $('.roi2'); 
    var roismall = $('.roismall'); 
 
    var a = parseInt($('.calc-a').val()); 
    var b = parseInt($('.calc-b').val()); 
    var x = parseInt($('.calc-x').val()); 
    var y = parseInt($('.calc-y').val()); 
    var z = parseInt($('.calc-z').val()); 
 
    //var ROI1 = z / (x * (2 – y/100)) – 1; //invalid or unexpected token 
    var ROI1 = z / (x * (2 - y/100)) - 1; 
    var ROI2 = (z + a*b/100)/(x*(2-y/100)); 
    var ROISMALL = ROI2-ROI1; 
 
    roi1.text(ROI1); 
    roi2.text(ROI2); 
    roismall.text(ROISMALL); 
} 
 
calc();

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>