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Mathematics of supermarket shopping manuscript
Example 1. Xiao Gang and Xiao Qiang in Grade One are discussing the profit rate. Xiao Gang said: The purchase price of my commodity A is 1600 yuan, and it is sold at a 10% discount at the marked price of 2,000 yuan. My commodity A has a high profit rate; Xiao Qiang said: The price of commodity B I bought was 320 yuan, which was sold at 20% off the list price, and the price was 460 yuan. My product B has a high profit margin. They are arguing endlessly. Please help us figure out whose profit rate is high.

Example 2. If the store sells the goods with the purchase price of 600 yuan at 20% of the list price, it can still make a profit 120 yuan. What is the list price of the goods?

Example 3. (Anhui senior high school entrance examination) Zhang Xin and Li Ming meet to go to the bookstore to buy books. Please find out the original price of the book that Li Ming bought last time according to their conversation.

Example 4. After a commodity is purchased, the retail price is determined to be 900 yuan per piece. In order to adapt to the market competition, the store reduced the price by 10% of the retail price and sold it in 40 yuan, with a profit of 10% (relative to the purchase price). What is the purchase price of this commodity?

Example 5. Cost of two clothes A and B * * In 500 yuan, in order to make a profit, the store decided to price clothes A at 50% profit and clothes B at 40% profit. In actual sales, at the request of customers, both clothes were sold at a 10% discount, so the store * * * made a profit 157 yuan, and asked how much the clothes A and B cost.

Example 6. An individual vendor sells two coats at the same time in a transaction, and the price of each coat is 135 yuan. According to the cost calculation, one of them made a profit of 25% and the other lost 25%.

(1) In this transaction, does the seller make money or lose money, or does he not make money or lose money?

(2) How about changing 135 yuan in the question to any positive number A?

* Example 7. (Shaanxi senior high school entrance examination) An enterprise produces a product, the cost price of each product is 400 yuan, and the sales price is 5 10 yuan. In order to further expand the market, the enterprise decided to lower the sales price and reduce the cost. Through market research, it is predicted that the sales price of this product will drop by 4% and the sales volume will increase by 65,438+00% in the next quarter, so as to keep the sales profit unchanged.

Example 8. A department store in a city 1 month 1 engages in promotional activities, and it is not preferential to shop no more than 200 yuan; More than 200 yuan, but less than 500 yuan's discount10%; More than 500 yuan, 500 yuan 10% discount, more than 20% discount. Someone spent 134 yuan and 466 yuan on shopping twice. Q:

(1) How much is this person's goods worth if they are not discounted twice?

(2) How much money did he save in this activity?

(3) If this person buys the same goods by combining two sums of money, will it save more money or lose more money? Explain your reasons?

A shopping mall is engaged in promotional activities, and all goods are 7.5% off. The price of sweaters is cheaper now than before. 60 yuan, what is the original price of this sweater?

All books in the children's bookstore are 30% off, all books in Xinhua Bookstore are "buy four get one free", and 20 books are bought in the sixth grade. Interesting Mathematics > Which bookstore is cheaper to buy?

The price of a commodity is 720 yuan, and the profit is 20% of the cost. If the profit is increased to 30% of the cost, how much will the price increase? (solve by equation.

The shop bought 100 color TV sets, each with a purchase price of 2000 yuan. After the purchase, the market is in good condition. 40 sets were sold in a short time, and then they were unsalable. The end of the year is coming. In order to reduce inventory and speed up circulation, the mall decided to give the remaining 60 sets a discount, asking how much discount on the basis of the retail price of 2,200 yuan per set, so that the mall can make 65,400 sets.

The original price of an air conditioner in a shopping mall is 2500 yuan, which can increase the sales volume 10 after discount. If the discounted sales volume is 100000 yuan, what is the discount rate?

Example 1 If a commodity is sold at 80% price, it can still make a profit of 20%. What is the expected profit percentage when pricing?