In the afternoon, my mother gave me twenty yuan to buy a bottle of soy sauce and a bottle of honey in the supermarket. After arriving at the supermarket, I first chose a bottle of "Douheng" brand soy sauce, which needs 4. 40 yuan. Then, I go to buy honey. There are only two kinds of money. The first one is 8. 60 yuan, there's another one for 8. 40 yuan. I thought, "the hexagon of the first type and the four corners of soy sauce can make up one yuan, which is easier to calculate." Moreover, the first one is two cents more expensive than the second one, indicating that the quality is also good. "

So, I picked up the first kind of honey and soy sauce, paid the money at the cashier's desk, and went home happily with the recovered 7 yuan money.