A costly dinner with girlfriend

Girl :- Lets go for a dinner tonight.

Boy :- Ok.

Girl :- But where will you take me?

Boy :- We will go to Mint Food (an economic restaurant).

Girl :- No. That's a very cheap place. Let's go to Tomato's (A brutally costly place)

Boy :- *silence for a minute* Ok, See you at 7. I will pick you up from your place.

Boy picks up girl at 7, On the way...

Boy :- Once I had pani puri (a.k.a. gol-gappa, an indian street food) competition with my sister and she ate 30 pani-puris and defeated me. 

Girl :- What's so difficult in it?

Boy :- Defeating me in Pani-puri eating competition is difficult.

Girl :- I can easily beat you.

Boy :- Please leave it. It's not your cup of tea.

Girl :- Let us have that competition right now.

Boy :- So you want to see yourself defeated? 

Girl :- Let's see.

They both stop at a Pani-puri stall. They start eating. After about 30 Pani-puri the boy gave up. The girl was also full, but to defeat her boyfriend, she ate one more and shouted, "You lose."

The bill was JUST 120rs.