Look at this problem.
There are 2 ways to travel to from the supermarket to the park, and 3 ways to travel from the park to the bus interchange.
How many ways are there to travel from the supermarket to the bus interchange via the park?
There are two different processes, supermarket to the park,
and the park to the bus interchange. Since they are two independent processes, we can apply the multiplication principle.
So, by the multiplication principle, there are a total of 2 times 3 ways. 2 times 3 is equal to 6. Therefore, there are 6 ways to get from the supermarket to the bus interchange via the park.