The shop buys a batch of bicycles at the purchase price of 400 yuan and the selling price of 500 yuan. When the number of bicycles sold is less than 4, the shop has gained the full cost. When all the bicycles are sold out, how much is the total profit?

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• 1. The shop buys a batch of bicycles at the purchase price of 400 yuan and the selling price of 500 yuan. When the number of bicycles sold is less than 4, the shop has gained the full cost. When all the bicycles are sold out, how much is the total profit?
• 2. The shop buys a batch of bicycles at the purchase price of 400 yuan and the selling price of 500 yuan. When the number of bicycles sold is less than 4, the shop has gained the full cost. When all the bicycles are sold out, how much is the total profit?
• 3. A club has a secret bookkeeping method. If the income of 500 yuan is - 600 yuan. Q: how much is the income of 100 yuan? Is it - 120 or 1000?
• 4. A math club has a "secret" accounting method. When they use 300 yuan, it is recorded as - 240; when they earn 300 yuan, it is recorded as + 360 Guess, when they use 100 yuan, how much is it? When they earn 100 yuan, how much is it? Explain your reason
• 5. A math club has a secret way of keeping accounts. When the income is 500 yuan, it is recorded as - 440. When the income is 200 yuan, it is recorded as + 260. Guess it, when they are in charge When they earn 50 yuan, how much is it? When they earn 80 yuan, how much is it? Tell me your reason
• 6. A math club has a secret way of accounting, when the income of 300 yuan is recorded as - 240 yuan, when the use of 300 yuan is recorded as + 360 yuan How do they remember when they earn 100 yuan and when they spend 100 yuan? Writing rules thank you
• 7. A factory has a secret way of accounting. When they earn 300 yuan, it is recorded as - 240 yuan; when they use 300 yuan, it is recorded as 360 yuan. Guess how much yuan they may record when they use 100 yuan? When they earn 100 yuan, how much is it? Give me your reasons
• 8. There is a "secret" accounting method in the kingdom of mathematics. When they earn 300 yuan, it is recorded as - 240 yuan; when they spend 200 yuan, it is recorded as + 260 yuan June 8 expenditure 100 yuan, 20 account - 1200 yuan ① How much should be recorded in the account on June 8? Please explain the reason ② What is the actual revenue and expenditure on June 20?
• 9. Xiaoming's monthly living expenses are 1000 yuan and education expenses are 500 yuan. They account for 5 / 2 of the total income. How much of the total income does education expenses account for? Answer up to 8:30 this evening
• 10. Xiao Ming's monthly living expenses are 1000 yuan and education expenses are 500 yuan, which account for two fifths of the total income, and how much of the total income does education expenses account for
• 11. If an air conditioner is sold at a fixed price, it can make a profit of 400 yuan. If it is sold at a 20% price reduction, it can also earn 80 yuan. That's the cost of the air conditioner
• 12. The cost price is 200 yuan. If I sell it for 500 yuan, I only charge 30% of the profit. What is the fastest and most convenient way?
• 13. The price of a dress is 500 yuan, 20% off, and 25% profit. The cost price of this dress is () The price of a dress is 500 yuan, 20% off, and 25% profit. The cost price of this dress is ()
• 14. The cost of manufacturing a kind of machine parts is 500 yuan. Now it's 200 yuan lower. What's the decrease? Now it's 200 yuan lower, what's the decrease?
• 15. The price of a dress is 500 yuan, 20% off, and 60% profit will be made after it is sold. How much is the cost price of this dress? Seek a complete solution
• 16. Party A deposits 500 yuan in the bank and Party B deposits 720 yuan in the bank. After that, Party A deposits 50 yuan and Party B deposits 120 yuan every month. A few months later, Party B's deposit is exactly 2 yuan of Party A's
• 17. At present, 121 tons of goods need to be transported, [car a can transport 5 tons, 400 yuan], [car B can transport 8 tons, 500 yuan], [car C can transport 10 tons, 600 yuan] Suppose every car is full ① If there are 13 vehicles in total, how many are vehicles a, B and C? What is the freight? ② Can you tell me how to ship it and how much is the least freight?
• 18. At the beginning of school, the school bought a batch of desks and chairs. The price of the desks was 474 yuan, 12 yuan less than three times that of the chairs. How much did the chairs cost?
• 19. The price of a desk is three times that of a chair. The school bought 30 sets of desks and chairs for 2400 yuan. How much are the desks and chairs?
• 20. The school has a sum of money to buy tables and chairs If you only buy a table, you can buy 40; if you only buy a chair, you can buy 60; if you want to buy a complete set (one table and one chair), you can buy () sets for this money, assuming that the money is available