| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | optional | US | Tipping at restaurants is optional and typically ranges from 15-20% of the bill. | 1 |
| 2 | optional | United States | Tipping at restaurants is optional, but typically expected as part of dining etiquette. | 1 |
| 3 | optional | United States | Tipping at restaurants is optional | 1 |