passwella.
Menu

WAEC Mathematics 1999 Question 6

Question 6

Ratio, Percentages and Rates

The side of a square is increased from 20cm to 21cm. Calculate the percentage increase in its area

  1. A.2.5%
  2. B.9.3%
  3. C.10.0%
  4. D.10.25%.
Show the answer and explanation

Answer: D (10.25%.)

Explanation

Area goes from 400 to 441 cm2, an increase of 41. 41/400 × 100% = 10.25%.