    </div>
      <div>
        Costs: <input type="number" min="0" ng-model="invoice.cost" required >
        <select ng-model="invoice.inCurr">
          <option ng-repeat="c in invoice.currencies">{{c}}</option>
        </select>
      </div>
      <div>
        <b>Total:</b>
        <span ng-repeat="c in invoice.currencies">
          {{invoice.total(c) | currency:c}}
        </span>
        <button class="btn" ng-click="invoice.pay()">Pay</button>
      </div>
    </div>
</body>
</html>