<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Example - example-guide-concepts-1</title>
  

  <script src="../../../angular.min.js"></script>
  

  
</head>
<body >
      <div ng-app ng-init="qty=1;cost=2">
      <b>Invoice:</b>
      <div>
        Quantity: <input type="number" ng-model="qty" required >
      </div>
      <div>
        Costs: <input type="number" ng-model="cost" required >
      </div>
      <div>
        <b>Total:</b> {{qty * cost | currency}}
      </div>
    </div>
</body>
</html>