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JAMB Mathematics 1979 Question 6

Question 6

Commercial Arithmetic

After getting a rise of 15%, a man's new monthly salary is ₦345. How much per month did he earn before the increase?

  1. A.₦330
  2. B.₦396.75
  3. C.₦300
  4. D.₦293.25
  5. E.₦360.
Show the answer and explanation

Answer: C (₦300)

Explanation

The new salary is 115% of the old one, so the old salary is 345 × 100/115 = ₦300.