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Nghĩa của bài này là:Trong một bán quảng cáo, bất cứ ai mua một chai nước trái cây với giá thường xuyên là 7 đô la có thể có được một chai thứ hai của nước bằng cách trả 1 đô la hơn. Một nhóm có 9 người, mỗi người trong số họ muốn một chai nước trái cây. Hỏi nhóm phải trả ít nhất bao nhiêu tiền ?
Giải:
Nếu mua một chai nước với giá 7 đô la mà được tặng thêm 1 chai với giá 1 đô la thì chỉ cần 4 người mua đã có 8 chai,người thứ 9 sẽ mua thêm một chai với giá 7 đô la.Vậy số tiền họ cần phải trả là:(7+1).4+7=39(đô la)
Đáp số:39 đô la
V. Read the passage. Circle the best answer A, B, or C to each of the questions. (1.25 points)
Jack is my best friend. He is a student in a secondary school in London. Every morning he gets up at about seven o’clock, has breakfast. Then he leaves for school. The school is far from his home, so he gets there by bus. He has lunch at the canteen. In the afternoon he studies until half past four and then he goes home. He doesn’t go to school on Saturdays or Sundays. At the weekend he usually goes to the cinema or theatre with his family. He loves his family very much. They are happy.
1. What’s Jack’s job?
A. a student B. a teacher C. a worker D. a doctor
2. What does the word “leave for” in line 2 mean?
A. run to B. swim to C. fly to D. go to
3. How does he go to work?
A. By car B. By bus C. By bike D. On foot
4. Where does he have lunch?
A. at the canteen B At home C. at restaurant D. at his friend’s house
5. What does he do at the weekend?
A. He goes to school. B. He watches television.
C. He does his homework. D. He goes to the cinema or theatre.
VI. Use the given words to write complete sentences. (1.25 points)
1. next week. / a museum / visiting / is / He /
⇒ He is visiting a museum next week.
2. need/ We/ my living room./ some furniture/ for/
⇒ We need some furniture for my living room.
3. does/ go / Where/ Lan/ on holiday?/
⇒ Where does Lan go on holiday?
4. mother/ a round/ has/ face./ My/.
⇒ My mother has a round face.
5. pass/ for /me/ some biscuits/ Can/, please?/ you/
⇒ Can you pass for me some biscuits, please?
VII. Rewrite these sentences without changing their meaning. (1.25 points)
1. She doesn’t have a bookshelf in her bedroom.
There isn’t a bookshelf in her bedroom.
2. The ruler is under the notebook.
The notebook is on the ruler.
3. He is the boy with blue eyes.
He has blue eyes.
4. This calculator belongs to Mike.
This is Mike's calculator.
5. It is necessary for you to do exercise regularly.
You should do exercise regularly because it's necessary.
The total cost of 50 laptops that Bill bought last month = 50 * 400£ = 20,000£.
For the 40 laptops that he sold at a profit of 30%, his selling price for each laptop = 400£ + 30% of 400£ = 520£. The total revenue from selling these 40 laptops = 40 * 520£ = 20,800£.
For the 10 laptops that he sold at a profit of 15%, his selling price for each laptop = 400£ + 15% of 400£ = 460£. The total revenue from selling these 10 laptops = 10 * 460£ = 4,600£.
Therefore, the total revenue from selling all 50 laptops = 20,800£ + 4,600£ = 25,400£.
Since the total revenue from selling all 50 laptops exceeded Bill's target of at least 25,000£, we can conclude that Bill reached his target last month.
Let's calculate the profits and revenues from the sale of Bill's laptops. Profit from selling 40 laptops:
- Profit on each laptop = 30% of 400£ = 120£
- Total profit from selling 40 laptops = 120£ x 40 = 4,800£
- Revenue from selling 40 laptops = (400£ + 120£) x 40 = 20,800£ Profit from selling 10 laptops:
- Profit on each laptop = 15% of 400£ = 60£
- Total profit from selling 10 laptops = 60£ x 10 = 600£
- Revenue from selling 10 laptops = (400£ + 60£) x 10 = 4,600£ Total profit and revenue from selling all 50 laptops:
- Total profit = 4,800£ + 600£ = 5,400£
- Total revenue = 20,800£ + 4,600£ = 25,400£ Bill reached his target of selling all 50 laptops for a total of at least 25.000£.