$bill_f->Label( -text => sprintf("\$%.2f",$bill->{RENTAL}))->grid();
$bill_f->Label( -text => sprintf("\$%.2f",$bill->{USAGE}))->grid();
$bill_f->Label( -text => sprintf("\$%.2f",$bill->{OTHER}))->grid();
$bill_f->Label( -text => sprintf("\$%.2f",$bill->{TOTAL}))->grid();