One day, Mr. White takes his mother to a shopping mall. He wants to buy a new pair of shoes for her. 

There are so many beautiful shoes, and the old woman tries on(试穿)some shoes happily. But she doesn't like any of them when she knows the prices. 

Seeing this, Mr. White speaks to the shopkeeper quietly(轻轻地), "Next time. when my mother shows interest in(对……感兴趣)some pairs, just tell her the price is only 15 dollars. "

"But that's not the real price!"the shopkeeper says.

"Dont worry!I will pay(付钱)for the shoes at the real price. "

Then, the old woman gets her favorite shoes. Mr. White pays 15 dollars at first, and then he pays another 50 dollars privately. 

Three days later, the shopkeeper asks Mr. White to come back and pay more money. Mr. 

White feels surprised. He asks, "Why?"Because your mother brings many of her friends to buy that kind of shoes. "