<div id="form_00001" class="formmort">
   <ul>

   <li id="li_1">

   <div>
     <input placeholder="Total funds required" type="text" name="minus"   id="minus" maxlength="255" />
   </div>
   </li>
   <li id="li_2">
   <div>
   <select id="interest" name="interest">
     <option value="0" selected="selected">Interest</option>
    <option value="7.9">7.9%</option>
    <option value="9.9">9.9%</option>
    <option value="12.9">12.9%</option>
    <option value="15.9">15.9%</option>

     </select>
   </div>
   </li> <li id="li_3">

   <div>
  <select id="time" name="time">
     <option value="5" selected="selected">Term Duration</option>
    <option value="36">36 Months</option>
    <option value="48">48 Months</option>
    <option value="60">60 Months</option>
    <option value="84">84 Months</option>

     </select>
   </div>
   </li>
   </ul>
    <div id="cal-results">
    <div id="amount"></div>
    </div>
   <input id="process" class="button_text" type="submit" name="submit" value="Calculate">
   </div>

$('#time, #interest, #minus').change(function(){
  var time = parseFloat($('#time').val()) || 0;
  var interest = parseFloat($('#interest').val()) || 0;
  var minus = parseFloat($('#minus').val()) || 0;
  var yearly = 12;
  var y = 0.01;
  var makear = (interest / yearly * y);
  var makean = (time); // 180
  var addone = 1; //+1
  var addonetoexpo = (makear + addone);
  var solved_expo = Math.pow(addonetoexpo, makean);
  var solve_top = (makear * solved_expo);
  var solve_bottom = (solved_expo - addone);
  var ready_divide = (solve_top / solve_bottom);
  var result_maker = (ready_divide * minus);

  var drb = result_maker;
  var noser = drb.toFixed(2); // HERE WE ADDED TWO DECIMAL SYSTEM
  var resultfinal = noser;


  $("#process").click(function(){

      $('#amount').text("Total: $" + noser.toLocaleString());
      // HERE WE ADDED SEPARATOR SYSTEM BUT IT IS NOT ADDING SEPARATOR TO OUTPUT

  });

 });