<script>
$('.t-input-group_pc').hide(300);
$(document).on('change','input[name="havepromo"]',function(e){
if($('input[name="havepromo"]').is(':checked') ){
$('.t-input-group_pc').show(300);
} else {
$('.t-input-group_pc').hide(300);
};
});
</script>