JSFiddle - React, Tailwind, and code Playground

HTML

<div id="sum">

</div>
<td class="selected">
2
</td>
<td class="selected1">
2
</td>
<td class="selected2">
2
</td>

JavaScript

var sum = 0;

$(".selected, .selected1, .selected2").each(function() {
        if(!isNaN(this.innerHTML) && this.innerHTML.length!=0) {
            sum += parseFloat(this.innerHTML);
        }

    });

$("#sum").html(sum.toFixed(2));