根据短文内容, 回答下列问题。
I'm Anna. Today is Sunday. I don't need to go to school. I like cooking with my mom on Sunday. I can cook noodles, cakes and fish well.
After finishing my homework, I find there is little food in the fridge (冰箱). So I go to the supermarket with my mom. There are many kinds of food in the supermarket. My mom likes Chinese food very much. She buys dumplings and some meat-balls. I enjoy Western (西方的) food, so I buy some salad and bread. I want to have hamburgers, too. We also buy some bananas. They look very good.
All the food is 122 yuan. I give the saleswoman (女店员) 150 yuan and she gives me 38 yuan. She makes a mistake!I give her 10 yuan and tell her why. She thanks me and she says I am a good girl. Then I go home with my mom, I am very happy. I get the food I like and I do something good.