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GATE CSE 2024 Session 2 Q8: Percentage increase in renewable share from two pie charts

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. Year 2007: Coal 35%, Gas 25%, Hydro 30%, Solar 5%, Wind 5%. Year 2023: Coal 20%, Gas 15%, Hydro 35%, Solar 20%, Wind 10%
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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?

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Answer: D (official GATE 2024 final answer key)

Concept used: Percentage change = (new − old) / old × 100, applied to the combined renewable share.

First step: Renewables: 2007 = 30 + 5 + 5 = 40%, 2023 = 35 + 20 + 10 = 65%.

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Source: official GATE 2024 Session 2 CS question paper and final answer key, organised by IISc Bangalore. Question paper · Answer key

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