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Saturday, 15 August 2026
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Mathematics Past Questions and Answers

Topic: Percentage increase and decrease

Jamb Mathematics Questions - Percentage increase and decrease

Question 1:
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
View Answer & Explanation
Question 2:
Father reduced the quantity of food bought for the family by 10% when he found that the cost of living had increased 15%. Thus the fractional increase in the family food bill is now
  • A \(\frac{1}{12}\)
  • B \(\frac{6}{35}\)
  • C \(\frac{19}{300}\)
  • D \(\frac{7}{200}\)
  • E \(\frac{5}{100}\)
View Answer & Explanation
Question 3:
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
View Answer & Explanation
Question 4:
The population of a village decreased from 1,230 to 1,040 due to breakout of an epidemic. What is the percentage decrease in the population?
  • A 15.44%
  • B 15.43%
  • C 15.42%
  • D 15.45%
View Answer & Explanation