JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.0.3/css/bootstrap.min.css">
<div class="container">
    <div class="row">
            <!-- Header -->
    <div class="page-header">
         <h3>ProBux RR Earnings Calculator</h3>

    </div>
        <div class="col-md-4">
            <div class="panel panel-default">
                <div class="panel-body">
                    <form role="form">
                        <div class="form-group">
                            <label for="RRNum">Rented Referrals</label>
                            <input type="text" class="form-control" id="RRNum" placeholder="Number only" />
                        </div>
                        <div class="form-group">
                            <label for="CPD">Average Clicks Per Day</label>
                            <input type="text" class="form-control" id="CPD" placeholder="Number Only" />
                        </div>
                        <div class="form-group">                            
                            <input type="button" id="calculate" class="btn btn-success" value="Calculate" />
                        </div>                                
                    </form>
                    
<ul class="list-group" style="display:none;">
  <li class="list-group-item"></li>
  <li class="list-group-item"></li>
  <li class="list-group-item"></li>
</ul>
            </div>
        </div>
    </div>
</div>

CSS

body {
    padding:10px;
}

JavaScript

$('#calculate').click( function () { calculate() });

function calculate() {
     var nRR  = $('#RRNum').val(),
          CPD = $('#CPD').val();
  var calc_day = (0.005 * CPD) * nRR + 0.04,
   calc_month = calc_day * 30,
    calc_year = calc_day * 365;
    $('.list-group').fadeOut( function() {
        console.log('$' + calc_day + ' Per day');
        console.log('$' + calc_month + ' Per month');
        console.log('$' + calc_year + ' Per year');
        $('.list-group li:eq(0)').text('$' + calc_day.toFixed() + ' Per day')
        $('.list-group li:eq(1)').text('$' + calc_month.toFixed() + ' Per month')
        $('.list-group li:eq(2)').text('$' + calc_year.toFixed() + ' Per year')
        $('.list-group').fadeIn()
    });         
}