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After getting a rise of 15%, a man's new monthly salary is N345. How much...

Mathematics
JAMB 1979

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
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Correct Answer: Option C
Explanation

Let x represent his monthly salary before increase 15% of

x = 345

% profit = (100 + 15)%

= 115%

\(\frac{115}{100}\)x = 345

115x = 34500

x = N300.00

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