Index: Delivery.pm
===================================================================
--- Delivery.pm	(revision 261)
+++ Delivery.pm	(revision 262)
@@ -56,7 +56,12 @@
 		if ( ref $price_modify eq 'ARRAY' && @$price_modify ) {
 			foreach my $mod ( @$price_modify ) {
 				if ( $mod->{level} <= $sum ) {
-					$price = $mod->{cost};
+					if ( $mod->{cost} =~ /(\d+)%/ ) {
+						my $mod = $1;
+						$price = sprintf("%.2f", ($self->price * $mod) / 100);
+					} else {
+						$price = $mod->{cost};
+					}
 				}
 			}
 		}