<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Example - example-guide-concepts-3-production</title>
  

  <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.3.1/angular.min.js"></script>
  <script src="invoice3.js"></script>
  <script src="finance3.js"></script>
  

  
</head>
<body >
      <div ng-app="invoice3" ng-controller="InvoiceController as invoice">
      <b>Invoice:</b>
      <div>
        Quantity: <input type="number" min="0" ng-model="invoice.qty" required >
  