Rs Aggarwal 2017 Solutions for Class 8 Math Chapter 9 Percentage are provided here with simple step-by-step explanations. These solutions for Percentage are extremely popular among Class 8 students for Math Percentage Solutions come handy for quickly completing your homework and preparing for exams. All questions and answers from the Rs Aggarwal 2017 Book of Class 8 Math Chapter 9 are provided here for you for free. You will also love the ad-free experience on Meritnation’s Rs Aggarwal 2017 Solutions. All Rs Aggarwal 2017 Solutions for class Class 8 Math are prepared by experts and are 100% accurate.
Page No 121:
Question 1:
Express each of the following as a fraction:
(i) 48%
(ii) 220%
(iii) 2.5%
Answer:
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Question 2:
Express each of the following as a decimal:
(i) 6%
(ii) 72%
(iii) 125%
Answer:
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Question 3:
Express each of the following as a percentage:
(i)
(ii)
(iii)
Answer:
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Question 4:
Convert the ratio 4 : 5 to percentage.
Answer:
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Question 5:
Express 125% as a ratio.
Answer:
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Question 6:
Which is largest in and 0.14?
Answer:
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Question 7:
(i) What per cent of 150 is 96?
(ii) What per cent of 5 kg is 200 g?
(iii) What per cent of 2 litres is 250 mL?
Answer:
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Question 8:
Find of Rs 3600.
Answer:
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Question 9:
If 16% of a number is 72, find the number.
Answer:
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Question 10:
A man saves 18% of his monthly income. If he saves Rs 3780 per month, what is his monthly income?
Answer:
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Question 11:
A football team wins 7 games, which is 35% of the total games played. How many games were played in all?
Answer:
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Question 12:
Amit was given an increment of 20% on his salary. If his new salary is Rs 30600, what was his salary before the increment?
Answer:
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Question 13:
Sonal attended her school on 204 days in a full year. If her attendance is 85%, find the number of days on which the school was opened.
Answer:
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Question 14:
A's income is 20% less than that of B. By what per cent is B's income more than A's?
Answer:
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Question 15:
The price of petrol goes up by 10%. By how much per cent must a motorist reduce the consumption of petrol so that the expenditure on it remains unchanged?
Answer:
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Question 16:
The population of a town increases by 8% annually. If the present population is 54000, what was it a year ago?
Answer:
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Question 17:
The value of a machine depreciates every year by 20%. If the present value of the machine be Rs 160000, what was its value last year?
Answer:
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Question 18:
An alloy contains 40% copper, 32% nickel and rest zinc. Find the mass of zinc in one kg of the alloy.
Answer:
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Question 19:
Balanced diet should contain 12% of proteins, 25% of fats and 63% of carbohydrates. If a child needs 2600 calories in his food daily, find in calories the amount of each of these in his daily food intake.
Answer:
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Question 20:
Gunpowder contains 75% nitre and 10% sulphur. Find the amount of gunpowder which carries 9 kg nitre. What amount of gunpowder would contain 2.5 kg sulphur?
Answer:
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Question 21:
Divide Rs 7000 among A, B and C such that A gets 50% of what B gets and B gets 50% of what C gets.
Answer:
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Question 22:
Find the percentage of pure gold in 22-carat gold, if 24-carat gold is 100% pure.
Answer:
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Question 23:
The salary of an officer is increased by 25%. By what per cent should the new salary be decreased to restore the original salary?
Answer:
Let the original salary be Rs 100
Then, after increment of 25% the salary becomes
=
To restore the original salary, let the new salary be decreased by x%.
Thus, we get
Therefore, the new salary must be reduced by 20% to restore the original salary.
Page No 123:
Question 1:
Tick (✓) the correct answer:
(a) 30%
(b) 40%
(c) 45%
(d) 60%
Answer:
(d) 60%
Page No 123:
Question 2:
Tick (✓) the correct answer:
0.8% when expressed as a decimal, is
(a) 0.08
(b) 0.008
(c) 8
(d) 0.8
Answer:
(b) 0.008
Page No 123:
Question 3:
Tick (✓) the correct answer:
6 : 5 when expressed as a percentage, is
(a)
(b) 90%
(c) 120%
(d) 6.5%
Answer:
(c) 120%
Page No 123:
Question 4:
Tick (✓) the correct answer:
5% of a number is 9. The number is
(a) 45
(b) 90
(c) 135
(d) 180
Answer:
(d) 180
Page No 123:
Question 5:
Tick (✓) the correct answer:
What per cent of 92 is 120?
(a) 75%
(b)
(c)
(d) none of these
Answer:
(c)
Page No 123:
Question 6:
Tick (✓) the correct answer:
What per cent of 10 kg is 250 g?
(a) 25%
(b) 5%
(c) 10%
(d) 2.5%
Answer:
(d) 2.5%
Page No 123:
Question 7:
Tick (✓) the correct answer:
40% of ? = 240
(a) 60
(b) 600
(c) 6000
(d) 960
Answer:
(b) 600
Page No 123:
Question 8:
Tick (✓) the correct answer:
?% of 400 = 60
(a) 6
(b) 12
(c) 15
(d) 20
Answer:
(c) 15
Page No 123:
Question 9:
Tick (✓) the correct answer:
(180% of ?) ÷ 2 = 504
(a) 400
(b) 480
(c) 600
(d) 560
Answer:
(d) 560
Page No 123:
Question 10:
Tick (✓) the correct answer:
20% of Rs 800 = ?
(a) Rs 160
(b) Rs 16
(c) Rs 1600
(d) none of these
Answer:
(a) Rs 160
Page No 123:
Question 11:
Tick (✓) the correct answer:
In an examination, Nitin gets 98 marks. This amounts to 56% of the maximum marks. What are the maximum marks?
(a) 75
(b) 150
(c) 175
(d) 225
Answer:
(c) 175
Page No 123:
Question 12:
Tick (✓) the correct answer:
A number is first increased by 10% and then reduced by 10%. The number
(a) does not change
(b) decrease by 1 %
(c) increases by 1 %
(d) none of these
Answer:
(b) decrease by 1 %
Page No 123:
Question 13:
Tick (✓) the correct answer:
A period of 4 hours 30 min is what per cent of a day?
(a)
(b) 20%
(c)
(d) 19%
Answer:
(a)
Page No 123:
Question 14:
Tick (✓) the correct answer:
In an examination, 65% of the total examinees passed. If the number of failures is 420, the total number of examinees is
(a) 500
(b) 1000
(c) 1200
(d) 1625
Answer:
(c) 1200
Page No 124:
Question 15:
Tick (✓) the correct answer:
A number exceeds 20% of itself by 40. The number is
(a) 50
(b) 60
(c) 80
(d) 320
Answer:
(a) 50
Page No 124:
Question 16:
Tick (✓) the correct answer:
A number decreased by gives 87. The number is
(a) 58
(b) 110
(c) 120
(d) 135
Answer:
(c) 120
Page No 124:
Question 17:
Tick (✓) the correct answer:
0.05 is what per cent of 20?
(a) 25%
(b) 2.5%
(c) 0.25%
(d) 0.025%
Answer:
(c) 0.25%
Page No 124:
Question 18:
Tick (✓) the correct answer:
One-third of 1206 is what per cent of 134?
(a) 3%
(b) 30%
(c) 20%
(d) 300%
Answer:
(d) 300%
Page No 124:
Question 19:
Tick (✓) the correct answer:
x% of y is y% of?
(a) x
(b) 100x
(c)
(d)
Answer:
(a) x
Page No 124:
Question 20:
Tick (✓) the correct answer:
What per cent of
(a) 2.5%
(b) 10%
(c) 20%
(d) 25%
Answer:
(a) x
Page No 125:
Question 1:
Express:
(i) 24% as a fraction;
(ii) 105% as a decimal;
(iii) 4 : 5 as a percentage;
(iv) 56% as a ratio.
Answer:
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Question 2:
If 34% of a number is 85, find the number.
Answer:
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Question 3:
The value of a machine depreciates every year by 10%. If the present value of the machine is Rs 54000, what was its value last year?
Answer:
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Question 4:
An alloy contains 30% copper, 42% nickel and rest zinc. Find the mass of zinc in 1 kg of alloy.
Answer:
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Question 5:
In a class, 60% of the total number of students are boys and there are 14 girls. How many students are there in the class?
Answer:
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Question 6:
Which is largest in and 0.15?
Answer:
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Question 7:
Mark (✓) against the correct answer:
What per cent of
(a) 2.5%
(b) 5%
(c) 7.5%
(d) 10%
Answer:
(d) 10%
Page No 125:
Question 8:
Mark (✓) against the correct answer:
A number decreased by 30% gives 84. The number is
(a) 90
(b) 110
(c) 120
(d) 135
Answer:
(c) 120
Page No 125:
Question 9:
Mark (✓) against the correct answer:
(?)% of 320 is 48?
(a) 25%
(b) 15%
(c) 14%
(d) 9%
Answer:
(b) 15%
Page No 125:
Question 10:
Mark (✓) against the correct answer:
What per cent of 45 is 54?
(a)
(b) 104%
(c) 108%
(d) 120%
Answer:
(d) 120%
Page No 125:
Question 11:
Mark (✓) against the correct answer:
A number exceeds 25% of itself by 60. The number is
(a) 75
(b) 45
(c) 80
(d) 65
Answer:
(c) 80
Page No 125:
Question 12:
Mark (✓) against the correct answer:
5% of which number is 12?
(a) 120
(b) 180
(c) 240
(d) 320
Answer:
(c) 240
Page No 125:
Question 13:
Fill in the blanks.
(i) of Rs 1200 = .........
(ii) 240 mL is ......... % of 3 L.
(iii) If x% of 35 is 42, then x = .........
(iv) = .........%.
(v) 120 = (.........)% of 80.
Answer:
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Question 14:
Write 'T' for true and 'F' for false for each of the following:
(i) 6% of 8 is 48.
(ii) 6 : 5 = 30%.
(iii)
(iv) 6 hours = 25% of a day.
Answer:
Hence, it is true.
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