eVidyarthi

Main Menu
  • eVidyarthi
  • School
    • Class 6th
      • Maths Class 6
      • Science Class 6
      • Hindi Class 6
      • व्याकरण
      • English Class 6
      • English Grammar
      • Sanskrit Class 6
      • Geography
      • Civics
      • History
    • Class 7th
      • Maths Class 7
      • Science Class 7
      • Hindi Class 7
      • व्याकरण
      • English Class 7
      • English Grammar
      • Sanskrit Class 7
      • Geography
      • Civics
      • History
    • Class 8th
      • Maths Class 8
      • Science Class 8
      • Hindi Class 8
      • व्याकरण
      • English Class 8
      • English Grammar
      • Sanskrit Class 8
      • Geography
      • Civics
      • History
    • Class 9th
      • Maths Class 9
      • Science Class 9
      • Hindi Class 9
      • English Class 9
      • English Grammar
      • व्याकरण
      • Economics Class 9
      • Geography Class 9
      • Civics Class 9
      • History Class 9
    • Class 10th
      • Maths Class 10
      • Science Class 10
      • Hindi Class 10
      • English Class 10
      • English Grammar
      • व्याकरण
      • Economics Class 10
      • History Class 10
      • Civics Class 10
      • Geography Class 10
    • Class 11th
      • Maths Class 11
      • Accounts Class 11
      • English Class 11
      • English Grammar
      • व्याकरण
      • Chemistry Class 11
      • Physics Class 11
      • Biology Class 11
    • Class 12th
      • Maths Class 12
      • Accounts Class 12
      • Chemistry Class 12
      • Physics Class 12
      • Biology Class 12
      • English Class 12
      • English Grammar
      • व्याकरण
    • Close
  • English
    • Basic English Grammar
    • Basic English Speaking
    • English Vocabulary
    • English Idioms & Phrases
    • Personality Enhancement
    • Interview Skills
    • Close
  • Softwares
    • Microsoft Word
    • PhotoShop
    • Excel
    • Illustrator
    • PowerPoint
    • Close
Maths Class 7 || Menu
  • Important
    • Sample Paper
    • Important Formulas
    • Revision Notes
    • Mathematics Book
    • MCQs
    • Close
  • Integers
    • Ex 1.1
    • Ex 1.2
    • Ex 1.3
    • Ex 1.4
    • MCQs
    • Ex. 1.1 NCERT Solutions
    • Ex. 1.2 NCERT Solutions
    • Ex. 1.3 NCERT Solutions
    • Ex. 1.4 NCERT Solutions
    • Close
  • Fractions and Decimals
    • Ex 2.1
    • Ex 2.2
    • Ex 2.3
    • Ex 2.4
    • Ex 2.5
    • Ex 2.6
    • Ex 2.7
    • MCQs
    • Ex. 2.1 NCERT Solutions
    • Ex. 2.2 NCERT Solutions
    • Ex. 2.3 NCERT Solutions
    • Ex. 2.4 NCERT Solutions
    • Ex. 2.5 NCERT Solutions
    • Ex. 2.6 NCERT Solutions
    • Ex. 2.7 NCERT Solutions
    • Close
  • Data Handling
    • Ex 3.1
    • Ex 3.2
    • Ex 3.3
    • Ex 3.4
    • MCQs
    • Ex. 3.1 NCERT Solutions
    • Ex. 3.2 NCERT Solutions
    • Ex. 3.3 NCERT Solutions
    • Ex. 3.4 NCERT Solutions
    • Close
  • Simple Equations
    • Ex 4.1
    • Ex 4.2
    • Ex 4.3
    • Ex 4.4
    • MCQs
    • Ex. 4.1 NCERT Solutions
    • Ex. 4.2 NCERT Solutions
    • Ex. 4.3 NCERT Solutions
    • Ex. 4.4 NCERT Solutions
    • Close
  • Lines and Angles
    • Ex 5.1
    • Ex 5.2
    • MCQs
    • Ex. 5.1 NCERT Solutions
    • Ex. 5.2 NCERT Solutions
    • Close
  • Triangle and its Properties
    • Ex 6.1
    • Ex 6.2
    • Ex 6.3
    • Ex 6.4
    • Ex 6.5
    • MCQs
    • Ex. 6.1 NCERT Solutions
    • Ex. 6.2 NCERT Solutions
    • Ex. 6.3 NCERT Solutions
    • Ex. 6.4 NCERT Solutions
    • Ex. 6.5 NCERT Solutions
    • Close
  • Congruence of Triangles
    • Ex 7.1
    • Ex 7.2
    • MCQs
    • Ex. 7.1 NCERT Solutions
    • Ex. 7.2 NCERT Solutions
    • Close
  • Comparing Quantities
    • Ex 8.1
    • Ex 8.2
    • Ex 8.3
    • MCQs
    • Ex. 8.1 NCERT Solutions
    • Ex. 8.2 NCERT Solutions
    • Ex. 8.3 NCERT Solutions
    • Close
  • Rational Numbers
    • Ex 9.1
    • Ex 9.2
    • MCQs
    • Ex. 9.1 NCERT Solutions
    • Ex. 9.2 NCERT Solutions
    • Close
  • Practical Geometry
    • Ex 10.1
    • Ex 10.2
    • Ex 10.3
    • Ex 10.4
    • Ex 10.5
    • MCQs
    • Ex. 10.1 NCERT Solutions
    • Ex. 10.2 NCERT Solutions
    • Ex. 10.3 NCERT Solutions
    • Ex. 10.4 NCERT Solutions
    • Ex. 10.5 NCERT Solutions
    • Close
  • Perimeter and Area
    • Ex 11.1
    • Ex 11.2
    • Ex 11.3
    • Ex 11.4
    • MCQs
    • Ex. 11.1 NCERT Solutions
    • Ex. 11.2 NCERT Soluions
    • Ex. 11.3 NCERT Solutions
    • Ex 11.4 NCERT Solutions
    • Close
  • Algebraic Expressions
    • Ex 12.1
    • Ex 12.2
    • Ex 12.3
    • Ex 12.4
    • MCQs
    • Ex. 12.1 NCERT Solutions
    • Ex. 12.2 NCERT Solutions
    • Ex. 12.3 NCERT Solutions
    • Ex. 12.4 NCERT Solutions
    • Close
  • Exponents & Powers
    • Ex 13.1
    • Ex 13.2
    • Ex 13.3
    • MCQs
    • Ex. 13.1 NCERT Solutions
    • Ex. 13.2 NCERT Solutions
    • Ex. 13.3 NCERT Solutions
    • Close
  • Symmetry
    • Ex 14.1
    • Ex 14.2
    • Ex 14.3
    • MCQs
    • Ex. 14.1 NCERT Solutions
    • Ex. 14.2 NCERT Solutions
    • Ex. 14.3 NCERT Solutions
    • Close
  • Visualising Solid Shapes
    • Ex 15.1
    • Ex 15.2
    • Ex 15.3
    • Ex 15.4
    • MCQs
    • Ex. 15.1 NCERT Solutions
    • Ex. 15.2 NCERT Solutions
    • Ex. 15.3 NCERT Solutions
    • Ex. 15.4 NCERT Solutions
    • Close

Class 7 Ex. 8.3 Maths NCERT Solutions

NCERT Solutions for Class 7 Maths Chapter 8 Comparing Quantities Ex 8.3

Ex 8.3 Class 7 Maths Question 1.
Tell what is the profit or loss in the following transactions. Also find profit per cent or loss per cent in each case.
(a) Gardening shears bought for ₹ 250 and sold for ₹ 325.
(b) A refrigerator bought for ₹ 12,000 and sold at ₹ 13,500.
(c) A cupboard bought for ₹ 2,500 and sold at ₹ 3,000.
(d) A skirt bought for ₹ 250 and sold at ₹ 150.

Solution:

(a) Here, CP = ₹ 250
SP = ₹ 325
Since SP > CP
∴ Profit = SP – CP
= ₹ 325 – ₹ 250 = ₹ 75

Hence, the required profit = ₹ 75
and Profit per cent = 30%

(b) Here, CP = ₹ 12,000
SP = ₹ 13,500
Since SP > CP
∴ Profit = SP – CP
= ₹ 13,500 – ₹ 12,000 = ₹ 1,500

Hence, the required profit = ₹ 1500 × 100

profit % = 12 \frac{1}{2}%

(c) Here, CP = ₹ 2500
SP = ₹ 3000
Since SP > CP
∴ Profit = SP – CP
= ₹ 3000 – ₹ 2500 = ₹ 500

Hence, the required profit = ₹ 500 and profit% = 20%

(d) Here, CP = ₹ 250
SP = ₹ 150
Here CP > SP
∴ Loss = CP – SP
= ₹ 250 – ₹ 150 = ₹ 100

Hence, the required loss = ₹ 100 and loss% = 40%

Ex 8.3 Class 7 Maths Question 2.
Convert each part of the ratio to Percentage:

(a) 3:1

(b) 2:3:5

(c) 1 : 4

(d) 1:2:5

Solution:

(a) 3 : 1
Sum of the ratio parts = 3 + 1 = 4

(b) 2 : 3 : 5
Sum of the ratio parts = 2 + 3 + 5 = 10

(c) 1 : 4
Sum of the ratio parts =1 + 4 = 5

(d) 1 : 2 : 5
Sum of the ratio parts = 1 + 2 + 5 = 8

Ex 8.3 Class 7 Maths Question 3.
The population of a city decreased from 25,000 to 24,500. Find the Percentage decrease.

Solution:

Initial population = 25,000
Decreased population = 24,500
Decrease in population
= 25,000 – 24,500 = 500
Percentage of decrease = 500 × 100/25000 = 2%
Hence the Percentage of decrease in population = 2%.

Ex 8.3 Class 7 Maths Question 4.
Arun bought a car for ₹ 3,50,000. The next year, the price went upto ₹ 3,70,000. What was the Percentage of price increase?

Solution:

Original price of the car = ₹ 3,50,000
Price increased next year = ₹ 3,70,000
Increase in price = ₹ 3,70,000 – ₹ 3,50,000
= ₹ 20,000
∴ Percentage of the increase in the price

Hence, the Percentage of increase in price

=

Ex 8.3 Class 7 Maths Question 5.
I buy a TV for ₹ 10,000 and sell it at a profit of 20%. How much money do I get for it?

Solution:

Here, CP = ₹ 10,000
Profit = 20%
SP = ?

Hence, the required money got by me = ₹ 12,000.

Ex 8.3 Class 7 Maths Question 6.
Juhi sells a washing machine for ₹ 13,500. She loses 20% in the bargain. What was the price at which she bought it?

Solution:

SP of the washing machine = ₹ 13,500
Loss = 20%
CP = ?

Hence, the cost price of the machine = ₹ 16875.

Ex 8.3 Class 7 Maths Question 7.
(i) Chalk contains calcium, carbon and oxygen in the ratio 10 : 3 : 12. Find the Percentage of carbon in chalk.
(ii) If in a stick of chalk, carbon is 3 g, what is the weight of the chalk stick?

Solution:

(i) Sum of the ratio parts = 10 + 3 + 12 = 25
∴ Percentage of carbon in chalk
= 3/25 × 100% = 12 %
Hence, the Percentage of carbon in chalk = 12%

(ii) Weight of carbon = 3 g
∴ Weight of chalk = 3/3 × 25 g = 25 g
Hence, the weight of chalk = 25 g

Ex 8.3 Class 7 Maths Question 8.
Amina buys a book for ₹ 275 and sells it at a loss of 15%. How much does she sell it for?

Solution:

CP of book = ₹ 275
Loss = 15%

Hence, the required selling price = ₹ 233.75

Ex 8.3 Class 7 Maths Question 9.
Find the amount to be paid at the end of 3 years in each case.

(a) Principal = ₹ 1200 at 12% p.a.

(b) Principal = ₹ 7500 at 5% p.a.

Solution:

(a) Given: Principal = ₹ 1200
Rate of interest = 12% p.a., T = 3 years
∴ Interest = P × R × T/100 = 1200 × 12 × 3/100
Amount = Principal + Interest
= ₹ 1200 + ₹ 432 = ₹ 1632
Hence, the required amount = ₹ 1632

(b) Given: Principal = ₹ 7500
Rate = 5% p.a.
Time = 3 years
∴ Interest = P × R × T/100 = 7500 × 5 × 3/100
= ₹1125
Amount = Principal + Interest
= ₹ 7500 + 11125 = ₹ 8625
Hence, the required amount = ₹ 8625.

Ex 8.3 Class 7 Maths Question 10.
What rate gives ₹ 280 as interest on a sum of ₹ 56,000 in 2 years?

Solution:

Given: Principal = ₹ 56,000
Interest = ₹280
Time = 2 years
Rate = ?

Hence, the required rate = 0.25%

Ex 8.3 Class 7 Maths Question 11.
If Meena gives an interest of ₹ 45 for one year at 9% rate p.a. What is the sum she has borrowed?

Solution:

Given: Interest = ₹ 45
Time = 1 year
Rate = 9% p.a.

 

Android App

eVidyarthi

Search On eVidyarthi

Evidyarthi on Facebook

Like us on Facebook

Follow Evidyarthi on Youtube

Learn English
Learn English Through हिन्दी
Job Interview Skills
English Grammar
हिंदी व्याकरण - Vyakaran
Mathematics Class 6th
Science Class 6th
हिन्दी Class 6th
Mathematics Class 7th
Science Class 7th
हिन्दी Class 7th
Mathematics Class 8th
Science Class 8th
हिन्दी Class 8th
Mathematics Class 9th
English Class 9th
Science Class 9th
Mathematics Class 10th
English Class 10th
Mathematics Class XI
Chemistry Class XI
Accountancy Class 11th
Accountancy Class 12th
Mathematics Class 12th
Microsoft Word
Microsoft Excel
Microsoft PowerPoint
Adobe PhotoShop
Adobe Illustrator
Learn German
Learn French
IIT JEE
Privacy Policies, Contact Us
Copyright © 2020 eVidyarthi and its licensors. All Rights Reserved.