1. A store bought 100 pieces of Class A goods and 80 pieces of Class B goods from the wholesale department of a company, which cost 2800 yuan. When retailing in the store, the price of each class A commodity increased by 15%, and the price of each class B commodity increased by 10%. In this way, after all the commodities were sold, the income of * * * was 36.

2. There are three workshops 180 people in a factory. The number of people in the second workshop is more than three times that of the first workshop, and the number of people in the third workshop is half that of the first workshop, which is less than 1 person. How many people are in each of the three workshops?

\

3. One team has 108 hectares of forest farm and 54 hectares of pasture. Now it is necessary to cultivate a new fruit tree and turn part of the grassland into a forest farm, so that the grassland area only accounts for 20% of the forest farm area. How many hectares of pasture area will be changed to forest farm?

4. A group of students go off-campus for training. They traveled at a speed of 5 km/h and walked for 18 minutes. The school should send an urgent notice to the team leader. The correspondent started from the school and chased the students by bike at the speed of14 km/h. How long will it take the correspondent to catch up with the students?

5.60 kilometers on foot, some people walk, some people take a car, and two people start at the same place. When the car arrives at the destination, they will pick up these people who are walking back. If the pedestrian's speed is 5 km/h, and he starts one hour earlier than the car, and the speed of the car is 60 km/h, how long will it take for the pedestrian to meet the car that will pick them up later?

6. Deposit a sum of money in the bank regularly for one year with an annual interest rate of 2.2%. Withdrawal at maturity, with principal and interest of 765,438+0, 540 yuan. How much is this fund? How much is the after-tax interest?

7. Someone borrowed 8,500 yuan from the bank and repaid it within 2 years, excluding compound interest. At maturity, someone returned 9350 yuan to the bank. What is the annual interest rate of this loan?

8. An enterprise borrowed a sum of money from a bank, and agreed that the repayment period was one year and the annual interest rate was 6%. The enterprise immediately used the money to buy a batch of goods and sold them at a price 35% higher than the purchase price. One year after the sale, the proceeds will be used to repay the loan principal and interest, leaving 65,438+045,000 yuan. How much is this loan?

9. 1997, a student deposited 100 yuan lucky money into the children's bank of the bank on a regular basis, and after the expiration, he took out 50 yuan to buy school supplies, and all the remaining 50 yuan and interest were deposited in the bank with regular interest for one year. If the annual interest rate of the deposit is kept at 10%, how much principal and interest can be obtained after maturity? (No interest tax)

10. There is a football made of 32 pieces of black and white cowhide, in which the black leather is a regular pentagon and the white leather is a regular hexagon. How many pieces of black leather and white leather do you need?

1 1. The calculation method of individual income tax on wage income stipulated by the state is as follows:

Monthly income 1 no more than 1200 yuan;

(2) The tax rate for the income exceeding 1.200 yuan to 1.700 yuan is 5% (5% of the income, the same below);

3. Income exceeding 1700 yuan to 3,000 yuan shall be taxed at the rate of 10%.

(1) Given someone's monthly salary 1600 yuan, how much personal income tax should be paid?

(2) If someone pays personal income tax in 65 yuan in a certain month, what is his monthly income?