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Railways PYQCBT 1 2016

RRB NTPC · Question 94

If the length and breadth of a rectangle are changed by +15% and -10% respectively, then what is the percentage change in the area of the rectangle? A. 2.5% B. 3.0% C. 3.5% D. 4.5%

  1. A

  2. C

  3. D

  4. B

Show answer & explanation

Answer: (B) C

Explanation

New area = 1.15 × 0.90 = 1.035 times the old, an increase of 3.5%. (Shortcut: 15 − 10 − 15 × 10/100 = 3.5%.)