Wendy is good at English and Chinese,but her math isn't good. She doesn't think it's useful.
One day,the clothes at Wendy's mom's store are on sale,so there are many people. Her mom wants to teach her a lesson,so she asks her to help out at the clothes store. When a woman walks in,Wendy walks to her. The woman says she wants to buy a sweater. After some time,she says, "I'll take this yellow one. What's the price of it?" Wendy says, "It is 800 yuan,but it's on sale. You can take it at half price (半价). Uh,you need to pay (支付) 400 yuan. " "I see. This is my VIP card. I can get a 20% discount (折扣),right?" "Oh,yes," Wendy says. "Then,you just need to pay 80 yuan. " The woman looks at Wendy in surprise , asking, "Are you sure?"
Then,Mrs. Black,Wendy's mom,comes and says to the woman, "I'm sorry. You need to pay 320 yuan,please. " Then,she looks at her daughter and asks, "Now,do you think math is useful?"