A factory used 5400 tons of water in April, saving 20% compared with March. How many tons of water were used in March?

My mother deposited 5000 yuan in the bank for a fixed period of one year, with an annual interest rate of 5.2%. According to national regulations, she should also pay 5% interest tax. How much after-tax interest can her mother get when it expires?

The price of a house at the end of 2003 was 600,000 yuan, which was 30% higher than that at the end of 2003 and 20% lower than that at the end of 2005. What was the price of this house at the end of 2004 and 2005 respectively?

4. Deposit 5000 yuan in the bank for one year, with the interest rate of 2.25%. How much principal and after-tax interest can I withdraw after maturity?

6. Xiaohua's father deposited 5000 yuan in the bank for two years at an annual interest rate of 2.70%. How much interest can he actually get at maturity? (Free of interest tax)

7. A highway maintenance team plans to build a highway with a length of 1200m. 15% of the total length was repaired in the first week and 13% of the total length was repaired in the second week. How many meters is the first week less than the second week?

8. The school has 180 basketball, football and volleyball. It is known that the ratio of basketball, football and volleyball is 5: 4: 3. How many balls are there?

9. The sixth grade students signed up for the math interest group, and the number of participants was 13 of the total number of sixth grade students. Later, 20 students took part. At this time, the ratio of students who participate is 3: 4. How many people are there in Grade One and Grade Six?

10. Build a circular road with a width of 1m along the circular flower bed with a diameter of 12m. How many square meters is the pavement area? (Keep the whole square meter)

1 1. A cow is tied to the grass. If the rope tied to the cow is 6 meters long, how many square meters of grass can the cow eat at most?

12. The minute hand length of the wall clock is 10cm, 1 hour. What is the area swept by the minute hand?

14. The ratio of girls to boys in the sixth grade of experimental primary school is 2: 3. There are 30 boys known. How many girls are there?

15. The original price of a fur coat is 7.5% off for 500 yuan Spring Festival promotion. Xiaohong's mother took 400 yuan and wanted to buy this fur coat. Is there enough money?

17.62.8cm thin iron wire just wound 10 on a round iron bar. What is the cross-sectional radius of this round iron bar?

18. Xiao Wang deposited 10000 yuan in the bank, with a fixed term of 3 years and an annual interest rate of 2.7%. When due, how much should Xiao Wang get in terms of principal and interest?

19. The school transported 200 seedlings, the teacher planted 10%, and the rest were distributed to Class A, Class B and Class C at 5:4:3. How many trees are classified as C?

20. The turnover of Huamei Mall in June 5438+February is 3 million yuan. If the business tax is paid at 15% of the turnover, how much should Huamei Mall pay?

21.In April, Miss Wang received her monthly salary from her work unit 1200 yuan. According to the individual income tax law, the individual income tax will be levied at the rate of 5% for the part of personal income exceeding 1000 yuan per month. How much personal income tax should Mr Wang pay this month?

Comrade, I put all this together. It's not easy!