Selected MCQ

Current Question
If a price is increased by 10% and then decreased by 10%, what is the net effect?
  • A. No change
  • B. 1% increase
  • C. 1% decrease
  • D. 2% decrease
Correct Answer: C
Explanation:
Net effect = −1%.
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
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 3
The price of petrol has increased by 25%. By what percent should consumption be reduced to keep expenditure constant?
  • A. 25%
  • B. 30%
  • C. 50%
  • D. 20%
Correct Answer: D
Explanation:
Reduction = 25/125 ×100 = 20%.
Related Question 4
The price of an article is reduced by 25%. By what percent should it be increased to restore the original price?
  • A. 33 1/3 %
  • B. 11 1/9 %
  • C. 9 1/11 %
  • D. 66 2/3 %
Correct Answer: A
Explanation:
Required increase = 25/75 ×100 = 33 1/3%.
Related Question 5
The price of an item is increased by 15%. By what percent must consumption be reduced to keep expenditure constant?
  • A. 10 20/23 %
  • B. 13 1/23 %
  • C. 16 2/3 %
  • D. 15 %
Correct Answer: B
Explanation:
Reduction = 15/115 ×100 = 13 1/23%.