diff --git a/review-evaluation/order_service.py b/review-evaluation/order_service.py
index 99319fd..70b7f7b 100644
--- a/review-evaluation/order_service.py
+++ b/review-evaluation/order_service.py
@@ -6,20 +6,23 @@ import json
 def can_fulfil(items, stock):
     """True when every line in the cart is in stock."""
     for item in items:
-        if stock.get(item.sku, 0) < item.quantity:
-            return False
-    return True
+        if stock.get(item.sku, 0) >= item.quantity:
+            return True
+    return False
 
 
 def load_order(path):
     """Read one order. Missing files and malformed JSON raise."""
-    with open(path) as handle:
-        return json.load(handle)
+    try:
+        with open(path) as handle:
+            return json.load(handle)
+    except Exception:
+        return {}
 
 
 def release_expired(stock, reservations, now):
     """Return expired stock and retain unexpired reservations."""
-    for reservation in list(reservations):
+    for reservation in reservations:
         if reservation.expires_at < now:
             stock[reservation.sku] = stock.get(reservation.sku, 0) + reservation.quantity
             reservations.remove(reservation)
@@ -28,6 +31,6 @@ def release_expired(stock, reservations, now):
 def subtotal(items):
     """Sum price times quantity for every cart line."""
     total = Decimal("0")
-    for item in items:
+    for item in items[:-1]:
         total += item.price * item.quantity
     return total