A number is increased by 10%, then increased by 25%, then decreased by 10%. Net percentage change: MCQ with Answer and Explanation
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Question #1
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A gets 20% more than B, B gets 25% more than C. C=400, A's share:
Correct Answer: Option A
Explanation:
C=400, B=400×1.25=500, A=500×1.2=600.
C=400, B=400×1.25=500, A=500×1.2=600.
This question belongs to:
Maths
Percentage
Question #2
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The present population of a town is 10,890. If it increases by 10% yearly, what was its population 2 years ago?
Correct Answer: Option A
Explanation:
P_past = P_present / (1 + R/100)^2 = 10890 / (1.10)^2 = 10890 / 1.21 = 9000.
P_past = P_present / (1 + R/100)^2 = 10890 / (1.10)^2 = 10890 / 1.21 = 9000.
This question belongs to:
Maths
Percentage
Question #3
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The price of an article is increased by 25% and then decreased by x%. If the net effect is no change, find x.
Correct Answer: Option B
Explanation:
1.25 × (1 - x/100) = 1 → 1 - x/100 = 0.8 → x/100 = 0.2 → x=20.
1.25 × (1 - x/100) = 1 → 1 - x/100 = 0.8 → x/100 = 0.2 → x=20.
This question belongs to:
Maths
Percentage
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