My dinner was $200 but I got 15% off because I had a coupon. We left a 20% tip. How much did dinner cost me?

It cost $204 (with the tip)

Step-by-step explanation:

You got $30 off, leaving you with $170 to pay.

15% into 0.15

200x0.15 = 30

200-30 = 170

The tip was $34.

20% into 0.20

170x0.20=34

In total, with the tip it cost you $204