Hi, I’m Bob. My mom asked me to go shopping with her. I hate it! Shopping is so boring. Look at the long list: twelve eggs, two kilos of pork, a box of butter, some chicken, a jar of jam...My mom said many things were on sale and she needed me to help her carry things. But I want to play soccer with my friends. Oh...here she comes. Why does Bob’s mom want to buy so many things?