The pie charts depict the shares of various power generation technologies in the total electricity generation of a count...

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.

Year 2007 pie chart (approx. shares): Coal 50%, Hydro 20%, Nuclear 10%, Solar 10%, Wind 10%.
Year 2023 pie chart (approx. shares): Coal 30%, Hydro 25%, Nuclear 10%, Solar 20%, Wind 15%.

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?

A. 25%   B. 50%   C. 77.5%   D. 62.5%

Accepted Answer

The share of renewable electricity generation increased by 62.5% over this period. Answer: D. 62.5% Two pie charts show how electricity generation is split among different technologies in 2007 and 2023. We need to add up the renewable shares (Hydro + Solar + Wind) for each year, then calculate the percentage increase. Because total electricity is the same in both years, the share change directly reflects the actual change in renewable output.