M: How much should I pay?

W: Let me see. A roast duck is 25 dollars. A plate of pork is 6 dollars and 50 cents. A boiled beef is 7 dollars. Two bottles of beer are 4 dollars. That’s total of 42 dollars and 50 cents.

M: Here is 50 dollars. Keep the change, please.

W: Oh, sorry sir. We take no tips here. Thank you all the same.