JSFiddle - React, Tailwind, and code Playground

by bruno_aw

HTML

<div id="CUB">Valor CUB R$ 1.215,40</div>
<div class="calc_cub">
    <input type="number" class="qtd" value="" placeholder="Calcule o CUB"/>
    <p>Total R$<span class="total"></span></p>
</div>

JavaScript

$(".calc_cub").on("keyup", ".qtd", function(){
		var valorCub = $("#CUB").text();		
		var number = parseFloat(valorCub);	
		var qtd = +$(this).val();
		$(".total").text(number * qtd).val().toFixed(2);
	});