WOOCS - WooCommerce Currency Switcher

Use this hook: https://currency-switcher.com/hook/woocs_raw_woocommerce_price/

Old way:

Open file index.php of the plugin, find public function raw_woocommerce_price($price) and instead

return $price;

write:

$price = round($price * 2, 0) / 2;
return $price;

http://stackoverflow.com/questions/11692770/rounding-to-nearest-50-cents