JSFiddle - React, Tailwind, and code Playground

by bluey

HTML

<span id="discount">0.00</span>
<span id='increment'>1.10</span>
<a href="#" id="btn">Add!</a>

JavaScript

$(function() {
 $('a#btn').click(function() { 
 var discount = parseFloat($("#discount").text());
 var increment = parseFloat($("#increment").text());
 var newDiscountVal = (discount + increment).toFixed(2);
 $("span#discount").text(newDiscountVal);
    });

});