During May Day, my mother and I went to the mall to buy clothes. But I think the price there is very strange: saying "buy 100 to send 100" means no money?

Mother said, "Silly daughter, how can you not use money?"

I said, "Because it says buy 100, get 100, which means 100- 100=0, so no money is needed!"

Mom said, "that's how you calculate." If so, everything in the mall is free, and many guests will come. This mall will lose a lot. "

Mom also said that you only need 50 yuan to buy 100 and get 100, you know?

After listening to my mother's analysis, I still don't understand. Why? It seems that I still have to go to the shopping mall to make a serious investigation or consult Ceng Laoshi to see what she has, because I know there is still a lot of math knowledge I haven't understood yet.

With a happy mood, I came to the school to ask Ceng Laoshi a math question. Ceng Laoshi said, "In fact, some of them exceeded 65,438+000. For example,109,200, 189 or above ... "

The teacher added, "If the amount exceeds 100 yuan, you will get a coupon of 100 yuan. Customers still have to spend enough money 100 yuan to get the coupons. Not as free as you said. " Ceng Laoshi praised my questions and welcomed me to ask more questions in the future.