Important questions for comparing quantities Class 8 maths CBSE Part 1

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Question 1
If a % is the discount on the marked price y, the discount is
a) (y/a) ×100
b) (a/y) ×100
a) (y/100) ×a
a) (100/year)
Question 2
X Bought a X box at Rs 35000 and sold it to Y.  Y in turns sold it to Z. Both X and Y made 20% profit. Which one of the following is true?
a) X and Y earn the same profit
b) X earned more profit Y
c) X earned less profit then Y
d) Cannot be determined
Question 3
 Find the following:
(I) 50 % of 140   (ii) 30 % of $ 750               (iii) 16.5 % of 4000 kg
(iv) 21/2 % of 80 l
(v) 0.8 % of 8 km              (vi) 150 % of 1000
(vii) 12 % of 360 m       (viii) 22/7 % of 7 l
(ix) 0.8 % of 250 g
(x) 3/4 % of $ 780
Question 4
True and False statement
a) C.P = M.P – Discount
b) Discount is the reduction given on Marked price of the article
c) If a discount x is available on the marked price y of the article, then discount % is (x/y) ×100
d)  Simple interest is always less than compound interest for the same principle, same interest rate and same time period (>1)
e) Sales tax is computed over the Selling price of the article and added to the bill of the customer
Question 5
The list price of an article is 100Rs.If you get a price discount of 15% and pay 5% for tax, what is the actual cost of your article?
Question 6
 In a Movie complex 75 % of seats were filled.  If there were 600 seats in the hall, how many seats were vacant?
Question 7
A real estate agent earns Rs 50000 as commission on the sale of the property. If the commission is 4% of the selling price. What is the selling price of the?
Question 8
 A Woman earns Rs 100000 per month and spends 65 % of it. How much money does she save every month?
Question 9
To clear his stock a Lifestyle offers a discount of 50 %. Find the discount on goods worth Rs1500?
Question 10
The population of a city increased from 60000 to 62500. What is the increase percent?
Question 11
An alloy of iron and zinc contains 40 % of iron and the rest is zinc. Find the weight of the zinc in 3 kg of the alloy?
Question 12. In an exam, 85 % of the children pass. Find the number of children who passed, if there were 1700 children.
Question 13
Jatin got 10% increase in his salary. If his new salary is 55000, find his previous salary.
Question 14
The enrollment in a Government school increased by 15 % from the year 2014 to 2015. If 1500 enrolled in 2014, how many enrolled in 2015.
Question 15
 For an amount x, explain why 20% increase followed by the 20% decrease is less than original amount x
Question 16
By what number must the given number be multiplied to increase the number by 10%?
Question 17
 The price of oil rises from Rs120 per litre to Rs 150 per litre. Find the percentage rise in the price of oil?
Question 18
 The population of a small locality in Gurgaon was 1000 in 2014 and became 1500 in 2015. By what percent did the population increases?

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