GATE CS 2024 Set 2 — Question 8

MCQ+2 / -0.67EasyData Interpretation (Bar, Pie, Graphs, Tables)Quantitative AptitudeGeneral AptitudeRatios, Percentages, Powers, Exponents & Logarithms

General Aptitude → Quantitative Aptitude → Data Interpretation (Bar, Pie, Graphs, Tables)

Last updated 20 August 2026

Question

The pie charts depict the shares of various power generation technologies in the total electricity generation of a country for the years 2007 and 2023.

Two pie charts showing the percentage distribution of power generation sources (Coal, Gas, Wind, Hydro, Solar) for the years 2007 and 2023.

The renewable sources of electricity generation consist of Hydro, Solar and Wind. Assuming that the total electricity generated remains the same from 2007 to 2023, what is the percentage increase in the share of the renewable sources of electricity generation over this period?

25%

50%

77.5%

62.5%

Correct answer

(D) 62.5%

Solution

We need to calculate the share of renewable sources (Hydro, Solar, Wind) for both years.

Year 2007:

Hydro: 30%
Solar: 5%
Wind: 5%

Total Renewable Share (2007) =

30 + 5 + 5 = 40\%

Year 2023:

Hydro: 35%
Solar: 20%
Wind: 10%

Total Renewable Share (2023) =

35 + 20 + 10 = 65\%

Percentage Increase:
The question asks for the percentage increase in the share.

\text{Percentage Increase} = \frac{\text{Final Share} - \text{Initial Share}}{\text{Initial Share}} \times 100

= \frac{65 - 40}{40} \times 100

= \frac{25}{40} \times 100

= \frac{5}{8} \times 100 = 62.5\%

GATE CS 2024 Set 2 — Question 8

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