Multiple choice

A number is first increased by 10% and then it is further increased by 20%. The original number is increased altogether by what percentage?

  1. 28%

  2. 30%

  3. 22%

  4. 32%
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

After a 10% increase, the value becomes 1.1 times original. After a further 20% increase, it becomes 1.1 × 1.2 = 1.32 times original. This represents a 32% overall increase. Options A (28%), B (30%), and C (22%) are common errors from adding percentages (10+20=30) or miscalculating the compound effect.

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