Some restaurants add service charge of between 5% and 10%, which will be indicated by the words ’propina’ or ’servicio’ near the bottom of the bill. Even if service charge has been added the waiter can be offered an additional 10% for exceptional service; this is also the going rate for tipping where service charge has not been added. In hotels porters expect about US$0.50 per bag. Taxi drivers are not tipped (the fare should be set before departure). Tour guides are customarily tipped.