+=item recur_cost_permonth CUST_PKG
+
+recur_cost divided by freq (only supported for monthly and longer frequencies)
+
+=cut
+
+sub recur_cost_permonth {
+ my($self, $cust_pkg) = @_;
+ return 0 unless $self->freq =~ /^\d+$/ && $self->freq > 0;
+ sprintf('%.2f', $self->recur_cost / $self->freq );
+}
+