If you are unsure of the policies, stick to the ten percent rule for restaurants, and the one Euro rule for everything else.
ຖ້າທ່ານບໍ່ແນ່ໃຈນະໂຍບາຍ, ຕິດກັບກົດລະບຽບສິບເປີເຊັນ ສໍາ ລັບຮ້ານອາຫານ, and the one Euro rule for everything else.