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WAEC Mathematics 1991 (August) Question 17

Question 17

Ratio, Percentages and Rates

Mrs. Kofi sold an article for C7.50 instead of C12.75. Calculate her percentage error, correct to one decimal place.

  1. A.41.2%
  2. B.18.3%
  3. C.5.3%
  4. D.1.7%
  5. E.1.4%
Show the answer and explanation

Answer: A (41.2%)

Explanation

Error = 12.75 − 7.50 = 5.25. Percentage error = 5.25/12.75 × 100 = 41.2%.