I'm having a fight with a coworker. I'm 1000% right but I need confirmation.

If you go to a restaurant and you get a discount off your bill, do you tip based on the original cost or the discounted cost?

the original amount
83.9%
the discounted amount
16.1%
Poll ended at .

@Firr the total amount after tax and before discounts

This is also the math used by Ziosks at Chili’s