all solution ex. 8.2 of ch8 ncert maths class 8
Answers
. 1. A man got 10% increase in his salary. If his new salary is Rs.1,54,000, find his original salary.
Ans. Let original salary be Rs.100.
Therefore New salary i.e., 10% increase
= 100 + 10 = Rs.110
New salary is Rs.110, when original salary = Rs.100
New salary is Rs.1, when original salary =
New salary is Rs.1,54,000, when original salary = = Rs.1,40,000
Hence original salary is Rs. 1,40,000.
. 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?
Ans. On Sunday, people went to the Zoo
= 845
On Monday, people went to the Zoo = 169
Number of decrease in the people
= 845 – 169 = 676
Decrease percent = = 80%
Hence decrease in the people visiting the Zoo is 80%.
3. A shopkeeper buys 80 articles for Rs.2,400 and sells them for a profit of 16%. Find the selling price of one article.
Ans. No. of articles = 80
Cost Price of articles = Rs. 2,400And Profit
= 16%
Cost price of articles is Rs.100, then selling price = 100 + 16 = Rs.116
Cost price of articles is Rs.1, then selling price =
Cost price of articles is Rs.2400, then selling price = = Rs.2784
Hence, Selling Price of 80 articles = Rs.2784
Therefore Selling Price of 1 article
= = Rs.34.80
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.
Ans. Here, C.P. = Rs.15,500 and Repair cost = Rs.450
Therefore Total Cost Price = 15500 + 450 = Rs.15,950
Let C.P be Rs.100, then S.P. = 100 + 15
= Rs.115
When C.P. is Rs.100, then S.P. = Rs.115
When C.P. is Rs.1, then S.P. =
When C.P. is Rs.15950, then S.P.
= = Rs.18,342.50
NCERT Solutions for Class 8 Maths Exercise 8.2
5. A VCR and TV were bought for Rs.8,000 each. The shopkeeper made a loss of 4% on the VCR and a profit of 8% on the TV. Find the gain or loss percent on the whole transaction.
Ans. Cost price of VCR = Rs.8000 and Cost price of TV = Rs.8000
Total Cost Price of both articles
= Rs.8000 + Rs.8000 = Rs. 16,000
Now VCR is sold at 4% loss.
Let C.P. of each article be Rs.100, then S.P. of VCR = 100 – 4 = Rs.96
When C.P. is Rs.100, then S.P. = Rs.96
When C.P. is Rs.1, then S.P. =
When C.P. is Rs.8000, then S.P.
= = Rs.7,680
And TV is sold at 8% profit, then S.P. of TV = 100 + 8 = Rs.108
When C.P. is Rs.100, then S.P. = Rs.108
When C.P. is Rs.1, then S.P. =
When C.P. is Rs.8000, then S.P.
= = Rs.8,640
Then, Total S.P.
= Rs.7,680 + Rs.8,640 = Rs. 16,320
Since S.P. >C.P.,
Therefore Profit = S.P. – C.P.
= 16320 – 16000 = Rs.320
And Profit% =
== 2%
Step-by-step explanation:
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