Selected MCQ

Current Question
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%.
Related Question 1
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 2
If a number is decreased by 20% and then increased by 25%, what is the result?
  • A. No change
  • B. 5% increase
  • C. 5% decrease
  • D. 10% increase
Correct Answer: A
Explanation:
0.8 × 1.25 = 1.
Related Question 3
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 4
The smallest number which when increased by 1 is divisible by 12, 18, 24 and 32 is ____.
  • A. 1439
  • B. 1440
  • C. 1459
  • D. 1449
Correct Answer: A
Explanation:
LCM − 1 = required number.
Related Question 5
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%.