JSFiddle - React, Tailwind, and code Playground

HTML

<div class="result"></div>  
<div class="tAdd">+</div>

CSS

.tAdd {
    margin-left: 50px;
    cursor: pointer;
    background: #9a9a9a;
    padding: 2px 0px 2px 10px;
    position: absolute;
    top: 6px;
    color: white;
    width: 20px;
}

JavaScript

function incSize (event) {
				var strPrice = '200p';		
        var pri = Number(strPrice.substring(0, strPrice.length - 1));  
        strPrice.substring.pri = (pri + pri) + 'p'; 
        var result = document.querySelector('.result');
        result.innerHTML = pri; 
    }
    $(document).ready(function () {
        $(".tAdd").bind("click", incSize);  
    });