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Zhaowei went to the stationery store to buy three pens, paid the clerk 20 yuan and took 3.2 yuan back. How much is each pen?
1. According to the math topic of primary school, it is: 20-3.2= 16.8.

16.8/3=5.6, which is the 5.6 yuan of each pen.

2. jump out of this inertia thinking and consider life shopping. It can be cheaper to buy more, and I don't know if the three pens I bought are the same. So there is no answer.

In the west, there is a habit of tipping. Does this 16.8 yuan include tips? unknown to the world

It seems that I think too much. The average student defaults to the first one.