Tipping around the world differs slightly but remains relative.
Most of us in North America are aware of tipping a standard 15-20% of a restaurant bill.
Here's a guide for tipping in other parts of the world:
-Europe: Many restaurants add a service charge to the bill, though it's customary to add a small amount. Aim for 15%.
-Asia: Tipping is not common in Japan, though a service charge may be added to the bill. In Thailand, India, Malaysia, Vietnam and Indonesia, 10% is the norm. Tipping is rare in Korea, Singapore, Taiwan and Nepal. Where tipping was unknown in China, locals in big cities may expect some monetary thanks.
-South America: A service charge is usually added of about 10%, but adding a little extra is common. In Argentina and Brazil, 13 to 15% is customary. Chile, Peru and Uruguay, 10% is average. Ecuador is a little lower at about 7.5%.
-Africa: In South Africa and Kenya, a 10% service charge is often added to the bill, but a voluntary tip in that amount would be expected. In Egypt, everyone wants a tip, so keep small amounts of dollar bills and local currency.