JAMB Mathematics 2010 Question 5

Question 5

Commercial Arithmetic

At what rate will the interest on N400 increase to N24 in 3 years reckoning in simple interest?

  1. A.4%
  2. B.2%
  3. C.3%
  4. D.5%
Show the answer and explanation

Answer: B (2%)

Explanation

R = 100I/(PT) = 100 × 24/(400 × 3) = 2%.