NCERT Class 8 Mathematics Solutions: Chapter 8 – Comparing Quantities Exercise 8.2 Part 1

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Profit and loss formula

Profit and Loss Formula

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Question: 1 A man got 10% increase in his salary. If his new salary is Rs. 1, 54,000 find his original salary.


Let original salary be Rs. 100

Therefore, new salary i.e. 10% increase

Here, New salary = 1, 54,000

Original salary =

Hence original salary is Rs. 1, 40,000.

Question: 2 On Sunday 845 people went to the Zoo. On Monday only 169 people went. What is the percent decrease in the people visiting the Zoo on Monday?


People went to Zoo on Sunday

People went to Zoo on Monday

Number of decrease in the people


Hence decrease in the people visiting the Zoo is 80%.

Question: 3 A Shopkeepers buys 80 articles for Rs. 2400 and sells them for a profit of 16%. Find the selling price of one article.


No. of article = 80

Cost of articles and profit


Selling price

SP of 1 article

Question: 4 The cost of an article was Rs. 15,500, Rs. 450 were spent on its repairs. If it sold for a profit of 15%, find the selling price of the article.


Here, C.P = Rs. 15,500 and repair cost = Rs. 450

So, total cost price


Selling price