The profit problem in discount sale The cost price of a store's clothing is a yuan. If the price is increased by 40% of the cost price, the price will be 〔 yuan. If the price is sold at a 20% discount, the actual price will be 〕 yuan, and the store will make a profit of 〕 yuan

The cost price of clothing in a store is a yuan. If the price is increased by 40%, the price is [(1 + 40%) a] yuan
If it is sold at a 20% discount, the actual price is [80% * (1 + 40%) a] yuan,
The profit of the store [80% * (1 + 40%) a - a = 0.12A] yuan

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1. A store sells an electronic organ at a discount. The purchase price of an electronic organ is 2400. If it is sold at 20% off the marked price, the profit will not be less than 10% of the actual price, What is the price range of the electronic organ It's mathematics, one yuan, one time!
2. The store gives a 20% discount on a certain commodity. It is known that its original price is 2200 yuan, and the profit margin after discount is 10%, indicating the purchase price of the commodity Equation solution)
3. A store sells an electronic organ at a discount. The purchase price of an electronic organ is 1800 yuan. If it is sold at 20% off the price, the profit will not be less than 10% of the actual price, So what is the price range of electronic organ?
4. If a bookstore sells a new book at a 10% discount on its price, it can still make a profit of 20% A. 26 yuan B. 27 yuan C. 28 yuan D. 29 yuan
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6. In order to improve teaching efficiency, the school wants to buy some TV sets to be installed in the classroom. The purchase price of TV sets is 1000 yuan, and the selling price is 1400 yuan. Because the school buys more TV sets, the store is ready to sell them at a discount. If the profit margin is 12%, how much discount does the store give?
7. A clothing store bought 100 pieces of a brand of clothing, the purchase price was 350 yuan / piece, and the price was set at 500 yuan / piece. After half of the sales, in order to finish the sales as soon as possible, it was ready to sell at a discount If the profit is not less than 12000 yuan, then the rest of the clothing can be sold at a maximum discount according to the price? (one yuan per time inequality) 2. If someone wants to go to area a 3.3km away, his walking speed is 90m / min, and his running speed is 210m / min. if he has to reach area a in another 30 minutes, how many minutes can he run? One yuan per time inequality) online, etc!
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