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- Identify the base.
- Convert percent to fraction/decimal.
- Calculate and match options.
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Correct Answer:
Method / Topic: Percentage
Let the original number be 100. Increasing it by 20% gives 100 × 1.20 = 120. A 20% decrease is then applied to 120, not to the original 100. Thus the new value is 120 × 0.80 = 96. Compared with the original value 100, the decrease is 4. Therefore the net percentage change is 4% decrease. Hence option A is correct.
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Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake
Shortcut used, common trap, and the fastest solving route
- Identify the base.
- Convert percent to fraction/decimal.
- Calculate and match options.
Question Locked
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Correct Answer:
Method / Topic: Percentage
Let the original number be 100. Increasing it by 20% gives 100 × 1.20 = 120. A 20% decrease is then applied to 120, not to the original 100. Thus the new value is 120 × 0.80 = 96. Compared with the original value 100, the decrease is 4. Therefore the net percentage change is 4% decrease. Hence option A is correct.
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