With the coming of the new year, major shopping malls have launched profit promotion activities such as buy one get one free, discount and return. My mother-in-law who happened to be far away from home was coming to my house for the Spring Festival, so my mother took the opportunity to add a TV set to her mother-in-law's room.

In the evening, my mother came home empty-handed. I was puzzled and asked what was going on. My mother said with a tired face, "I went to many shopping malls, and the preferential strategies of the same product in each store are different." I don't know how to choose. " My mother had all kinds of discount leaflets in her hand, and after reading them for a while, she didn't think about it. Dad said patiently, "son, do you know what a discount is?"

"Of course, such as sixty percent off, is the original price to sell. Similarly, several discounts are sold at a discount. " I suddenly realized, "So, I can use' percentage' to solve it!" I immediately found a piece of paper and wrote down the preferential strategies of the three stores my mother went to on a piece of paper, and compared them one by one.

First of all, the price of the first TV set is 4000 yuan, and the audience will get a 20% discount, that is, the current price is 80% of the original price, so multiply 4000 by 80% = 3200 yuan; The second is 3600 yuan, and after 3000, I will return to 300 yuan, so I will use 3600-300 = 3300 yuan; The third one is 4500 yuan, and if it exceeds 4000 yuan, it will be 30% off, so multiply 4500 by 30% off = 3 150 (yuan). 3 150<3200 & lt3300, comparatively speaking, the third one has the highest cost performance.

I told my mother about my grades, and my mother was very happy and took me to buy a TV set. It turns out that shopping also contains many math problems. As long as we calm down and think, these problems can actually be solved with what we have learned in mathematics. Mathematics is really everywhere in life!