If the price of a commodity is reduced by 10% for the first time and increased by 10% for the second time, if the price after two price adjustments is a yuan, write the algebraic formula of the original price of the commodity Please write down the idea and steps in detail

100a/99

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1. The unit price of a certain commodity is B yuan. After a 20% discount on the original price, the price of each commodity is reduced by 10 yuan. At this time, the price is expressed as______ &Nbsp; & nbsp; & nbsp; yuan
2. The original price of a commodity in a shopping mall is a yuan. Because it is unsalable, the price of the commodity is reduced by 10% and then by 10%. The algebraic expression containing a is used to express the price of the commodity after the price is increased In a shopping mall, the original price of a commodity is a yuan. Because it is unsalable, the price will be reduced by 10% and then by 10%. Later, the sales will be increased by 20% because of the sharp increase in sales. The algebraic expression containing a is used to express the price of the commodity after the price increase and simplify the algebraic expression
3. The price of a commodity is reduced by 20%, and the current price is the original price______ %．
4. If the price of a commodity is reduced by 20%, what is the relationship between the current price and the original price A. The current price is 80% of the original price B: The current price is 80% lower than the original price C: The present price is 20% of the original price
5. The price of a commodity is reduced by 20% and then increased by 10%. The current price of this commodity is the original price
6. The price of a commodity after price reduction is 80 yuan, which is 1 / 4 lower than the original price. How much is the original price
7. After a price reduction of 10 yuan, the price of a product is 80 yuan. This product has reduced the original price by 10%______ %．
8. For a commodity, the original price is 80 yuan, but now the price is reduced by 20 yuan, so it is reduced by 25%, right What percentage of 1.270 kg is equivalent to 300 kg? How much less is 2.12.5m than 15m? 3. How much is 90 tons more than 75 tons? How much is 75 tons less than 90 tons?
9. After a 20% reduction in the price of an 80 yuan item, the price has been raised by 5 yuan. How much higher is the price now?
10. The original price of a commodity is 80 yuan, and the current price is 60 yuan. How much has it decreased?
11. The price of a commodity is increased by 10% first and then decreased by 10%. The current price is () a, 9 / 10 b, 10 / 11 C and 9 / 100 of the original price
12. How much is the original price of each commodity? (all commodities are reduced by 1 / 8) Current price of bicycle: 350 yuan Current price of DVD: 588 yuan Current price of rice cooker: 168 yuan
13. If the original price of a commodity is a yuan, the first price reduction is 8%, and the second price reduction is 5%, then the current price is () yuan emergency
14. How much is the original price of a commodity if it is first increased by one ninth and then decreased by one ninth
15. The unit price of a commodity is 270 yuan after 8% price reduction. How much is the original price of this commodity
16. How much is the original price of a commodity after a 10% discount
17. A product is sold at a 10% discount. The current price is ()% of the original price, and the price is reduced by ()%
18. The price of a commodity is 120 yuan. If you can reduce the price by 15%, you can earn 20 yuan; if you can earn 8 yuan, you have to reduce the price by ()%
19. When a store sells two items at the same time, they are both 120 yuan. It is known that one item earns 20% and the other item loses 20%, so the store earns 20% when it sells these two items If a store sells two goods at the same time, the cost is 120 yuan. It is known that one of the goods makes 20% and the other loses 20%, then does the store make or lose? 9 (Note: the cost is 120 yuan)
20. When a store sells two items at the same time, it gets 120 yuan each. One of them earns 20% and the other loses 20%. Is it a profit or a loss to sell two items at the same time?