Single correct option
Ravi's monthly salary is 25% more than Sunil's. By what percentage is Sunil's salary less than Ravi's?
- A. 18%
- B. 20%
- C. 22.5%
- D. 25%
Show answer and solution
Answer: (B) 20%
Let Sunil's salary be 100, so Ravi's is 125. Sunil's salary is less by 25, and the comparison is made against Ravi's salary (the base is 125).
Percentage = 25/125 × 100 = 20%.
Tip: if A is r% more than B, then B is r/(100 + r) × 100 % less than A. Here 25/125 = 1/5 = 20%. Option 25% is the classic trap of using the wrong base.
Percentage = 25/125 × 100 = 20%.
Tip: if A is r% more than B, then B is r/(100 + r) × 100 % less than A. Here 25/125 = 1/5 = 20%. Option 25% is the classic trap of using the wrong base.
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