JSFiddle - React, Tailwind, and code Playground

by EveGeen

HTML

<form>
                <select id="percent">
                        <option value="10">10%</option>
                        <option value="20">20%</option>
                </select>

                <input  type="text" name="b" value="0">

      <label>Price</label> 

        <input type="text" name="c" value="">
</form>

JavaScript

function calc()
{
   var tot1=parseInt($('#percent').val());
   var tot2=parseInt($("input[name='b']").val());
    var tot=tot2/100*tot1+tot2;
    $('input[name="c"]').val(tot);
}

$('#percent').change(function() {    
    calc();
});

$('input[name="b"]').change(function() {    
    calc();
});