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WAEC Mathematics 2013 Question 7

Question 7

Ratio, Percentages and Rates

A sales boy gave a change of ₦68 instead of ₦72. Calculate his percentage error.

  1. A.4%
  2. B.5 5/9 %
  3. C.5 15/17 %
  4. D.7%
Show the answer and explanation

Answer: B (5 5/9 %)

Explanation

Error = 72 − 68 = ₦4. Percentage error = error ÷ true value × 100% = 4/72 × 100% = 5 5/9 %.