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UI Post-UTME Mathematics 2013 Question 14

Question 14

Ratio, Percentages and Rates

A student was asked to correct 0.02539 to two significant figures gave its value to two decimal places. Calculate the percentage error

  1. A.20%
  2. B.16⅔%
  3. C.15%
  4. D.10%
Show the answer and explanation

Answer: A (20%)

Explanation

2 s.f. gives 0.025 but 2 d.p. gives 0.03; error = 0.005, and 0.005/0.025 × 100% = 20%.