By what percentage did electrical power production increase from 1951 to 2011?
2015
By what percentage did electrical power production increase from 1951 to 2011?
Answer: D. 900% — ConceptPercentage increase measures how much a quantity has grown relative to its initial value. Use: percentage increase = ((final value − initial value) /…
- A.
100%
- B.
300%
- C.
600%
- D.
900%
Show answer & explanation
Correct answer: D
Concept
Percentage increase measures how much a quantity has grown relative to its initial value.
Use: percentage increase = ((final value − initial value) / initial value) × 100.
Application
From the table, the initial power production in 1951 was 10 GW and the final production in 2011 was 100 GW.
Increase = 100 − 10 = 90 GW.
Percentage increase = (90 / 10) × 100 = 900%.
Cross-check
The final value is ten times the initial value. Therefore, the increase is nine times the initial value, which is 900%.
Result: Electrical power production increased by 900%.