A computer is now 2 / 13 lower than the original price, which is just 800 yuan lower. How much is the original price of this computer?

800/(2/13)

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11. The current price of a computer is 2 / 15 lower than the original price, which is just 800 yuan lower. How much is the original price of this computer? (equivalent relationship) for help~
12. The current price of a computer is 2 / 15 lower than the original price, which is just 800 yuan lower. How much is the original price
13. The price of a laptop is reduced by 1 / 9 at first, and then increased by 1 / 9. Is the current price lower or higher than the original price What's the formula
14. The original price of a down jacket was 600 yuan. First, the price was increased by 4 / 1. Later, a sales promotion was held and the price was reduced by 4 / 1. How much is the current price?
15. The original price of a commodity is 140 yuan. First, the price is increased by 25%. Later, due to promotion, the price is reduced by 25%. How much is the current price?
16. A school plans to buy a number of computers, first learned from two shopping malls that the price of the same model of computer is 4000 yuan, and there are certain discounts for buying more computers The preferential terms of a shopping mall are: the first one is charged according to the original quotation, and the other one is 25% off. The preferential terms of B shopping mall are: 20% off (1) If you buy in a mall, you need to charge (); if you buy in B mall, you need to charge () (2) Under what circumstances are the charges of the two shopping malls the same? Under what circumstances is it more favorable to buy in a shopping mall? Under what circumstances is it more favorable to buy in B shopping mall?
17. The school sports room needs to buy 50 volleyballs. There are two shopping malls A and B available. The price of volleyballs in both shopping malls is 28 yuan, but the preferential methods are different, For every 10 volleyballs bought in department store a, 2 volleyballs will be given away for free. For less than 10 volleyballs bought in department store B, each volleyball will be given a discount of 4 yuan. In order to save money, which store should the school buy? Please explain by calculation
18. A school plans to buy a number of computers. Now we know from two shopping malls that the price of each computer of the same model is 6000 yuan, and there is a certain discount for buying more computers. The preferential conditions of shopping mall a are: the first computer is charged at the original price, and the rest is 25% discount; the preferential conditions of shopping mall B are: 20% discount for each computer. (1) write down the difference between the charges of two shopping malls and the number of computers bought What's the relationship? (2) What's the better way to buy in a shopping mall? (3) What's more favorable to buy at B mall? (4) Under what circumstances are the charges of the two shopping malls the same?
19. A school plans to buy several computers. Now we know from two shopping malls that the price of each computer of the same model is 5000 yuan, and there is a certain discount for buying more computers, 1. Write down the relationship between the charges of the two shopping malls and the number of computers they buy. 2. What's more favorable to buy in shopping mall a? 3. What's more favorable to buy in shopping mall B? 4. What's the same charge in the two shopping malls? The original price is 5000 yuan
20. A school plans to buy a number of computers. Now we know from two shopping malls that the price of each computer of the same model is 6000 yuan, and there is a certain discount for buying more computers. The preferential condition of shopping mall a is that the first computer will be collected at the original price, and the other computers will be given 25% discount. The preferential condition of shopping mall B is that each computer will be given 20% discount, and the cost of purchasing computers in which shopping mall is less than 1 yuan