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 in a table-service restaurant and using an off-menu discount like a coupon or discount card, then the higher of: tip on original cost, or the amount a coupon has saved - e.g. would have tipped 10 but saved 15? Tip is now 15.
I wouldn't feel the same for on-menu 'discounts' like combos though, that just feels like the actual cost.
Although I'm in the UK where tipping isn't mandatory, so.