阅读回答问题
I am Nick. I am a student of Grade 7. My mum and my classmates call me Mr. Forgetful (健忘的). They say that I always forget something. Today is Saturday. I will show my mother I am a careful boy and I can remember everything I should do. "Mum, I will go shopping for you today" I say to my mother. "All right. I will give you a shopping note to make you remember all the things. " Mum says happily. I go to the Times Supermarket with the shopping note on foot. It is not far from my home. I find all the things in the note very quickly. I am very happy and say to myself, "This time I remember all the things. " Now it's time for me to pay for the things, but I can't find any money in pockets. I say sorry to the shop assistant and run home. When I get home, my mother is standing at the door. She gives 200 yuan to me and says with a smile, "I think you'd better take a basket with you, too. "At last, I pay for the things and take them back home. When I get home, shout in a happy voice, "Mum, I don't forget anything this time!" "Really? How much are the things and how much is the change?" "The things are 152 yuan and the change is…" Oh, my god, I forget the change!