Discussion
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 | Year 2023 | |
|---|---|---|
| Coal | 35% | 20% |
| Gas | 25% | 15% |
| Wind | 5% | 10% |
| Hydro | 30% | 35% |
| Solar | 5% | 20% |
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?
Answer: D
The share of renewables rose by 62.5%.
Add the Hydro, Solar and Wind shares for each year:
\[ \begin{aligned} 2007: &\ 30 + 5 + 5 = 40\% \\ 2023: &\ 35 + 20 + 10 = 65\% \\ \text{increase} &= \frac{65 - 40}{40} \times 100 = 62.5\% \end{aligned} \]
Since the total generation is unchanged, the rise in share is also the rise in renewable output.
25% is the increase in percentage points (65 - 40), not the percentage increase. 50% and 77.5% do not follow from the shares in the two charts.
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