add_filter('woocommerce_get_price_html', 'custom_show_price_in_bgn_and_eur', 100, 2);
function custom_show_price_in_bgn_and_eur($price, $product) {
$price_bgn = floatval($product->get_price());
$exchange_rate = 1.95583;
$price_eur = $price_bgn / $exchange_rate;
$price = wc_price($price_bgn, array('currency' => 'BGN')) . ' / ' . wc_price($price_eur, array('currency' => 'EUR'));
return $price;
