The pie charts depict the shares of various power generation technologies in…
2024
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.
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%
Attempted by 11 students.
Show answer & explanation
Correct answer: D
Answer: 62.5%
Compute total renewables in 2007: Hydro 30% + Solar 5% + Wind 5% = 40%.
Compute total renewables in 2023: Hydro 35% + Solar 20% + Wind 10% = 65%.
Find the change in share (percentage points): 65% − 40% = 25 percentage points.
Convert to percent increase relative to the original share: (change ÷ original) × 100 = (25 ÷ 40) × 100 = 62.5%.
Key point: distinguish between an absolute change in percentage points and a percentage increase relative to the original value.
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