Selina solutions concise mathematica class 7 icse Solutions for Chapter 8 percent and percentage

Q1) Express each of the following as percent :

(i) \frac{3}{4}

(ii) \frac{2}{3}

(iii) 0.025

(iv) 0.125

(v) \frac{3}{8}

(vi) 0.25

Q2) Express the following percentages as fractions and as decimal numbers :

(i) 7\frac{1}{2}\%

(ii) 2.50%

(iii) 0.02%

(iv) 175%

(v) 5%

(vi) 25%

Q3) What percent is :

(i) 16 hours of 2 days?

(ii) 40 paisa of Rs. 2?

(iii) 25 cm of 4 meters

(iv) 600 gm of 5 kg?

Q4) Find the value of:

(i) 5% of Rs. 350

(ii) 10% of Rs. 400.40

(iii) 1% of Rs. 50

(iv) 12\frac{1}{2}\%\ of\ 80\ kg

(v) \frac{5}{8}\%\ of\ Rs.\ 600

(vi) 33\frac{1}{3}of\ 27m

Q5) In a class of 60 children, 30% are girls. How many boys are there?

Q6) In an election, two candidates A and B contested. A got 60% of the votes. The total votes polled were 8000. How many votes did each get?

Q7) A person saves 12% of his salary every month. If his salary is ₹2,500, find his expenditure.

Q8) Seeta got 75% marks out of a total of 800. How many marks did she lose?

Q9) A shop worth ₹25,000 was insured for 95% of its value. How much would the owner get in case of any mishappening?

Q10) A class has 30 boys and 25 girls. What is the percentage of boys in the class?

Q11) Express :

(i) 3\frac{2}{5} as a percent

(ii) 0.0075 as percent

(iii) 3 : 20 as percent

(iv) 60 cm as percent of 1 m 25 cm

(v) 9 hours as a percent of 4 days.

Q12) (i) Find 2% of 2 hours 30 min.

(ii) What percent of 12 kg is 725 gm?

Q1) Deepak bought a basket of mangoes containing 250 mangoes 12% of these were found to be rotten. Of the remaining, 10% got crushed. How many mangoes were in good condition?

Q2) In a Maths Quiz of 60 questions, Chandra got 90% correct answers and Ram got 80% correct answers. How many correct answers did each give?

What percent is Ram’s correct answers to Chandra’s correct answers?

Q3) In an examination, the maximum marks are 900. A student gets 33% of the maximum marks and fails by 45 marks. What is the passing mark ? Also, find the pass percentage.

Q4) In a train, 15% people travel in first class, 35% travel in second class. The balance travel in the A.C. class? Calculate the percentage of A.C. class travellers?

Q5) A boy eats 25% of the cake and gives away 35% of it to his friends. What percent of the cake is still left with him?

Q6) What is the percentage of vowels in the English alphabet?

Q7) (i) 6\frac{1}{4}\%\ of what number is 375?

(ii) 0.2% of a number is 5. Find the number.

(iii) 30 is 16\frac{2}{3}\% of a number. Find the number.

Q8) The money spent on the repairs of a house was 1% of its value. If the repair costs Rs. 5,000, find the cost of the house.

Q9) In a school out of 300 students, 70% are girls and 30% are boys. If 30 girls leave and no new boy is admitted, what is the new percentage of girls in the school?

Q10) Kumar bought a transistor for Rs. 960. He paid 12\frac{1}{2}

% cash money. The rest he agreed to pay in 12 equal monthly installments. How much will he pay each month?

Q11) An ore contains 20% zinc. How many kgs of ore will be required to get 45 kg of zinc?

Q1) The salary of a man is increased from Rs. 600 per month to Rs. 850 per month. Express the increase in salary as a percent.

Q2) Increase :

(i) 60 by 5%

(ii) 20 by 15%

(iii) 48 by 121 %

(iv) 80 by 140%

(v) 1000 by 3.5%

Q3) Decrease :

(i) 80 by 20%

(ii) 300 by 10%

(iii) 50 by 12.5%

Q4) What number :

(i) When increased by 10% becomes 88?

(ii) When increased by 15% becomes 230?

(iii) When decreased by 15% becomes 170?

(iv) When decreased by 40% becomes 480?

(v) When increased by 100% becomes 100?

(vi) When decreased by 50% becomes 50?

Q5) The price of a car is lowered by 20% to Rs. 40,000. What was the original price? Also, find a reduction in price.

Q6) If the price of an article is increased by 25%, The increase is Rs. 10. Find the new price.

Q7) If the price of an article is reduced by 10%, the reduction is Rs. 40. What is the old price?

Q8) The price of a chair is reduced by 25%. What is the ratio of:

(i) Change in price to the old price.

(ii) Old price to the new price.

Q9) If x is 20% less than y, find :

(i) \frac{x}{y}

(ii) \frac{y-x}{y}

(iii) \frac{x}{y-x}

Q10) If x is 30% more than y; find :

(i) \frac{x}{y}

(ii) \frac{y+x}{y}

(iii) \frac{y}{y-x}

Q11) The weight of a machine is 40 kg. By mistake, it was weighed as 40.8 kg. Find the error percent.

Q12) From a cask, containing 450 litres of petrol, 8% of the petrol was lost by leakage and evaporation. How many litres of petrol was left in the cask?

Q13) An alloy consists of 13 parts of copper, 7 parts of zinc and 5 parts of nickel. What is the percentage of each metal in the alloy?

Q14) In an examination, first division marks are 60%. A student secures 538 marks and misses the first division by 2 marks. Find the total marks of the examination.

Q15) Out of 1200 pupils in a school, 900 are boys and the rest are girls. If 20% of the boys and 30% of the girls wear spectacles, find :

(i) how many pupils in all, wear spectacles?

(ii) what percent of the total number of pupils wear spectacles?

Q16) Out of 25 identical bulbs, 17 are red, 3 are black and the remaining are yellow. Find the difference between the numbers of red and yellow bulbs and express this difference as a percent.

Q17) A number first increases by 20% and then decreases by 20%. Find the percentage increase or decrease on the whole.

Q18) A number is first decreased by 40% and then again decreased by 60%. Find the percentage increase or decrease on the whole.

Q19) If 150% of a number is 750, find 60% of this number.