diff --git a/application/views/mobile_first/ah-lantern-form.php b/application/views/mobile_first/ah-lantern-form.php
index 0224ff27..a52fb431 100644
--- a/application/views/mobile_first/ah-lantern-form.php
+++ b/application/views/mobile_first/ah-lantern-form.php
@@ -675,6 +675,14 @@
     </form>
 </div>
 <script>
+    function calcTotalPrice(ticketPrice, adultNumber) {
+        var totalPrice = ticketPrice*adultNumber;
+        if (adultNumber >= 10) {
+            totalPrice = totalPrice * 0.95;
+        }
+        
+        return totalPrice;
+    }
     var adultNumberNode = document.getElementById("adultNumberValue");
     var ticketTypeList = document.querySelectorAll("input[name='ticket_type']");
     var totalPriceText = document.getElementById("totalPriceText");
@@ -694,7 +702,7 @@
             } else if (currentTarget.value === 'VIP + Free Transfer') {
                 ticketPrice = 159;
             }
-            totalPrice = ticketPrice*adultNumberValue;
+            var totalPrice = calcTotalPrice(ticketPrice, adultNumberValue);
             totalPriceText.innerText = '$'+totalPrice;
             totalPriceHidden.value = totalPrice;
         });
@@ -704,7 +712,7 @@
     plusButton.addEventListener('click', function(event) { 
         var adultNumberValue = parseInt(adultNumberNode.value) + 1;
         adultNumberNode.value = adultNumberValue;
-        totalPrice = ticketPrice*adultNumberValue;
+        var totalPrice = calcTotalPrice(ticketPrice, adultNumberValue);
         totalPriceText.innerText = '$'+totalPrice;
         totalPriceHidden.value = totalPrice;
     });
@@ -713,7 +721,7 @@
         if (beforeValue > 1) {
             var adultNumberValue = beforeValue - 1;
             adultNumberNode.value = adultNumberValue;
-            totalPrice = ticketPrice*adultNumberValue;
+            var totalPrice = calcTotalPrice(ticketPrice, adultNumberValue);
             totalPriceText.innerText = '$'+totalPrice;
             totalPriceHidden.value = totalPrice;
         }