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JAMB Mathematics 2005 Question 4

Question 4

Commercial Arithmetic

A father decided to give 20% of his monthly income to his three children as their monthly allowance. The eldest child got 45% of the allowance and the youngest got 25%. How much was the father's monthly income if the second child got N3,000?

  1. A.N33,000
  2. B.N45,000
  3. C.N50,000
  4. D.N60,000
Show the answer and explanation

Answer: C (N50,000)

Explanation

The second child got 100 − 45 − 25 = 30% of the allowance, so the allowance is N10,000. That is 20% of income, so income = N50,000.