Selected MCQ

Current Question
If a number increases by 20% and then by another 30%, total increase is ____.
  • A. 50%
  • B. 56%
  • C. 60%
  • D. 65%
Correct Answer: B
Explanation:
1.2 × 1.3 = 1.56 → 56%.
Related Question 1
In a hospital, injections last 15 days. If the number of patients increases, for how many days will they last?
  • A. 10
  • B. 15
  • C. 16
  • D. 12
Correct Answer: A
Explanation:
Increased consumption reduces duration.
Related Question 2
If a number increases by 30% and then decreases by 20%, net effect is ____.
  • A. 4% increase
  • B. 4% decrease
  • C. No change
  • D. 6% increase
Correct Answer: A
Explanation:
1.3 × 0.8 = 1.04 → 4% increase.
Related Question 3
If a number decreases by 50% and then increases by 100%, net effect is ____.
  • A. No change
  • B. 50% increase
  • C. 50% decrease
  • D. 100% increase
Correct Answer: A
Explanation:
0.5 × 2 = 1.
Related Question 4
If population increases by 20% in one year and 25% in next, total increase is ____.
  • A. 45%
  • B. 50%
  • C. 55%
  • D. 60%
Correct Answer: B
Explanation:
1.2 × 1.25 = 1.5 → 50%.
Related Question 5
If a number increases by 100% and then decreases by 50%, net change is ____.
  • A. No change
  • B. 50% increase
  • C. 50% decrease
  • D. 25% increase
Correct Answer: A
Explanation:
2 × 0.5 = 1 → no change.