NCERT Class 8 Mathematics Solutions: Chapter 8 – Comparing Quantities Exercise 8.2 Part 1
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Profit and Loss Formula
Question: 1 A man got 10% increase in his salary. If his new salary is Rs. 1, 54,000 find his original salary.
Answer:
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?
Answer:
People went to Zoo on Sunday
People went to Zoo on Monday
Number of decrease in the people
Decrease
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.
Answer:
No. of article = 80
Cost of articles and profit
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.
Answer:
Here, C.P = Rs. 15,500 and repair cost = Rs. 450
So, total cost price
Profit
Selling price