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WAEC Mathematics 2009 Question 2

Question 2

Variation

In a particular year, the exchange rate of Naira (₦) varies directly with the Dollar ($). If ₦1122 is equivalent to $8, find the Naira equivalent of $36.

  1. A.₦8976
  2. B.₦5049
  3. C.₦140.25
  4. D.₦31.17
Show the answer and explanation

Answer: B (₦5049)

Explanation

$1 = 1122 ÷ 8 = ₦140.25, so $36 = 36 × 140.25 = ₦5049.