Is 20% a good tip?

Related questions

1. Does Dominos delivery accept card?
2. How much do you tip the pizza delivery guy?
3. Can u pay cash for Dominos delivery?
4. Do you tip a handyman?
5. Is Dominos 30 minutes or free?
6. Does Dominos deliver to my area?
7. Is $2 a good tip?
8. Should I deposit my tips?
9. How much is tip for pizza delivery?
10. Are you supposed to tip delivery drivers?

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