Baked Bean Cans

Stage: 1 Challenge Level: Challenge Level:1

Next time you go to a supermarket, have a look at the way cans are stacked. Or you could ask an adult to help you search for some pictures on the internet.
It would help to find some cans to stack for yourself. It doesn't matter whether they're unopened or empty and washed out.
Why do supermarkets stack cans?