2/ When you swipe your card and return the signature slip, there is a tip on it. how much are you willing to pay？

Write it down on paper (also 15% to 20%) and add it to your expenses.

Write down the total in the column of total, and then sign it.

At night, people pay the bill and pay the total amount, and your tip is brushed away.

If you suspect trouble, you'd better pay in cash. No trouble.