Selected MCQ

Current Question
A worker’s salary increased by 30% and then decreased by 30%. Net change is ____.
  • A. 90% increase
  • B. 45% increase
  • C. 9% decrease
  • D. Same
Correct Answer: C
Explanation:
Net decrease = 9%.
Related Question 1
A number is increased by 20% and then decreased by 20%. What is the net change?
  • A. 4% increase
  • B. 4% decrease
  • C. No change
  • D. 2% decrease
Correct Answer: B
Explanation:
Net effect = −4%.
Related Question 2
Salary reduced by 10% and then increased by 10%. Net change is ____.
  • A. No change
  • B. 10% increase
  • C. 1% decrease
  • D. 5% decrease
Correct Answer: C
Explanation:
Net effect = −1%.
Related Question 3
The average salary of 20 workers is Rs. 5000. If one leaves and the average becomes Rs. 4800, what was his salary?
  • A. Rs. 6000
  • B. Rs. 7000
  • C. Rs. 8000
  • D. Rs. 9000
Correct Answer: D
Explanation:
Difference = Rs. 4000.
Related Question 4
If a number is decreased by 30% and then increased by 30%, net effect is ____.
  • A. No change
  • B. 9% decrease
  • C. 9% increase
  • D. 6% decrease
Correct Answer: B
Explanation:
0.7 × 1.3 = 0.91 → 9% decrease.
Related Question 5
A number is increased by 40% and then decreased by 20%. Net increase is ____.
  • A. 10%
  • B. 12%
  • C. 15%
  • D. 20%
Correct Answer: B
Explanation:
1.4 × 0.8 = 1.12 → 12%.