Answer:
$1
Step-by-step explanation:
If you receive truly awful (or rude) service, don't leave without providing a tip. Believe me, a $1 tip will be noticed much more than no tip since many people forget to return to the table and your server may think you just forgot. However, before you leave a lower tip, try to take into consideration the staffing and patron level in the restaurant, and keep in mind your server may just be having a bad day. Leaving a pleasant note of encouragement or a decent tip may be enough to turn their day around.
Source: https://lifehacker.com/how-much-to-tip-for-good-and-bad-service-according-to-5952182
