After getting a rise of 15%, a man's new monthly salary is N345. How much per month did he earn before the increase?

  • A N330
  • B N396.75
  • C N300
  • D N293.25
  • E N360
jamb 1979mathematics

The correct answer is C. N300

Let's say that the man's monthly salary before the increase was x.

After getting a rise of 15%, his new monthly salary is

x + 0.15x = 1.15x.

We are told that his new monthly salary is N345, so we can set up an equation to find his original salary:

1.15x = 345

\(x = \frac{345}{1.15} = 300\). Therefore, he earned N300 per month before the increase.

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