I used translation hook. Worked for me.
add_filter(‘gettext’, ‘change_price_text_filter’, 20, 3);
function change_price_text_filter( $translated_text, $untranslated_text, $domain ) {
if ( $domain == “events-manager” && $translated_text == “Price” ) {
$translated_text = “Price inc. VAT”;
}
return $translated_text;
}