Percentage_lecture_for_students_of_USPA.pptx

basic percentage formula for teaching

1. Percentage

2. Calculate 25% of 80 _______________ Question

3. If 15% of apples are bad, out of 200 apples, how many apples are bad? _______________ Question

4. Express 3/8 in percentage form ________________ Question

5. The price of a pen is increased from Rs . 5 to Rs . 7. What is the percentage increase? __________ x 100 = __________ % Question

6. The number of employees in a company decreased from 40 to 28. What is the percentage decrease in the number of employees? __________ x 100 = __________ % Question

7. Coconut oil is now being sold at Rs . 27 per kg. During last month, its cost was Rs . 24 per kg. Find by how much percent a family should reduce its consumption, to keep the expenditure the same. Question

8. A car increases its speed by 25%. After that, it again increases its speed by 20%. By what percentage is the car’s final speed greater than its original speed? Question

9. The table below shows the population (in thousands) of a town over a 5 - year period. Which of the given years registered the maximum percentage change over the previous year? Answer: ______________________ Question

10. If 45 is 120% of a number, then what is 80% of the same number? A) B) C) D) 30 32 36 38 Question

11. The population of a town was 3600 three years back. It is 4800 right now. What will be the population three years down the line, if the rate of growth of population is constant over the years? A) B) C) D) 6400 6000 5800 6600 Question

12. Two students appeared for an examination. One of them secured 9 marks more than the other and his score was 56% of the sum of their marks. The marks obtained by them are: A) B) C) D) 39, 30 43, 32 42, 33 43, 34 Question

13. Peter got 30% of the maximum marks in an examination and failed by 10 marks. However, Paul, who took the same examination, got 40% of the total marks and got 15 marks more than the pass mark. What was the pass mark in the examination? A) B) C) D) 75 250 90 85 Question

14. A vendor sells 60% of apples he had and throws away 15% of the remaining apples. Next day, he sells 50% of the remaining apples and throws away the rest. What % of the apples does the vendor throw away? A) B) C) D) 23 17 77 29 Question

15. If the numerator of a fraction is increased by 20% and its denominator is decreased by 10%, the fraction becomes 16/21. Find the original fraction. A) B) C) D) 4/7 7/4 2/7 3/7 Question

16. The price of tea has increased by 25%. The percentage of reduction that a family should effect in the use of tea so as not to increase expenditure on this account is A) B) C) D) 25 20 30 None of these Question

17. A medical student has to secure 40% mark to pass. He gets 80 and fails by 60 marks. Find the maximum marks. A) B) C) D) 150 250 350 450 Question

18. What is the total number of customers in a shop on a particular day when 31% of them purchase on credit and the number of those who do cash purchase exceeds the number of those who do credit purchase by 247? A) B) C) D) 605 560 650 1650 Question

19. If p% of p is 36, then p = ? A) B) C) D) 15 60 600 3600 Question

20. A man spends 40% of his income for his food, 15% for his clothes and 20% for house rent and saves the rest. If his income is Rs . 34400, find the amount of his savings. A) B) C) D) Rs . 7800 Rs . 8600 Rs . 25800 Rs . 9670 Question

21. Vidya secured 35 marks out of 50 in English and 28 marks out of 40 in Mathematics. In which subject did she get better marks and by how much? A) B) C) D) English, 4 percentage points Mathematics, 4 percentage points English, 10 percentage points None of these Question

22. The difference between X increased by 12.5% and X decreased by 25% is 30. What is X? A) B) C) D) 100 90 240 80 Question

23. What is the % change in the area of a rectangle when its length increases by 10% and its width decreases by 10%? A) B) C) D) + 1% No change - 1% None of these Question

24. Mr. Jones gave 40% of the money he had, to his wife. He also gave 20% of the remaining amount to each of his three sons. Half of the amount now left was spent on miscellaneous items and the remaining amount of Rs. 12,000 was deposited in the bank. How much money did Mr. Jones have initially? A) B) C) D) 100000 90000 240000 80000 Question

25. Peter got 30% of the maximum marks in an examination and failed by 10 marks. However, Paul who took the same examination got 40% of the total marks and got 15 marks more than the passing marks. What were the passing marks in the examination? A) B) C) D) 100 90 85 80 Question

26. The population of a town is 1,76,400. If it increases at the rate of 5% per annum, What was it 2 years ago? A) B) C) D) 100000 160000 200040 840000 Question

27. The value of a machine depreciates at the rate of 10% per annum. If its present value is Rs. 1,62,000, what will be its worth after 2 years? What was the value of the machine 2 years ago? A) B) C) D) 200000 140000 180000 210000 Question

28. Pie chart: Favorite Subjects of 500 Students How many students like Social Studies and Hindi together? Question

29. Pie chart: Favorite Subjects of 500 Students What is the difference in the number of students who prefer English and Science? Question

30. Pie chart: Favorite Subjects of 500 Students If 20 more students are added and all prefer English, what will be the new percentage of students preferring English? Question

31. Pie chart: Favorite Subjects of 500 Students What angle in the pie chart represents Science? Question

32. THANK YOU