JSFiddle - React, Tailwind, and code Playground

HTML

<div id="output">10</div>
<div id="increase">Increase</div>

CSS

https://jsfiddle.net/user/login/

JavaScript

$('#increase').click(function() {
  var one = $('#output').val();
  var increase = 10;
  var output = +one + increase;

  $('#output').val(output.toFixed(2));
  document.getElementById('output').innerHTML = value;
});