JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" name="item-qty-input" value="1">
<input type="text" name="item-rate-input" value="35">

JavaScript

var itemQtyInput = $('input[name="item-qty-input"]').val();
var itemRateInput = $('input[name="item-rate-input"]').val();
var itemPriceCalc = parseInt(itemRateInput) + parseInt(itemQtyInput);
alert(itemPriceCalc);