Question Bank - Environmental Studies

Here's the question bank on all the environmental studies topics.

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Study the rates of petrol and diesel in New Delhi given in the following table -OilRates of one litre in 2020Rates of one litre in 2021DieselRs. 81.00Rs. 90.72PetrolRs. 92.00Rs. 102.12In one year the increase in the rates of diesel and petrol respectively is -

A.
10% and 9%
B.
12% and 10%
C.
12% and 11%
D.
13% and 11%

Solution:

Concept:Percentage:A number or amount is defined as a part of a hundred.Percentage= (part/whole) À” 100Example: 6% of 100 can be calculated as:(6/100 À” 100) = 6%Formula to calculate the rate of increase:Calculate the difference between the two values.Then divide the difference by the previous year.Multiply the value by 100.Explanation:Increase in rate of diesel:(90.72 - 81) = 9.72(9.72/81) = 0.12(0.12 À” 100) = 12%Increase in rate of petrol:(102.12 - 92) = 10.12(10.12/92) = 0.11(0.11 À” 100) = 11%Thus, the increase in the rates of Diesel = 12%Petrol = 11%

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