Radius of a circle increased by 100%. Percentage increase in area: MCQ with Answer and Explanation

Question Report Error

Radius of a circle increased by 100%. Percentage increase in area:

A. 200%

B. 100%

C. 300%

D. 400%

Answer: Option C

Solution (By JKExamLibrary)

Area proportional to radius². New radius 2r, area 4 times, increase = 300%.

This question belongs to: Maths Percentage

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Practice More Percentage Questions

Question #1 Report Error

Price increased 15% then 10%. Single equivalent increase:

A. 26.5%

B. 27%

C. 24.5%

D. 25%

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Correct Answer: Option A

Explanation:
1.15 × 1.1 = 1.265, increase 26.5%.

This question belongs to: Maths Percentage

Question #2 Report Error

If x is 80% of y, what percentage of x is y?

A. 120%

B. 125%

C. 100%

D. 80%

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Correct Answer: Option B

Explanation:
x = 0.8y. Therefore, y = x / 0.8 = 1.25x. Thus, y is 125% of x.

This question belongs to: Maths Percentage

Question #3 Report Error

A man saves 18% of salary Rs. 12000. His expenditure:

A. 9560

B. 9960

C. 9840

D. 9640

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Correct Answer: Option C

Explanation:
Spends 82% of 12000 = 9840.

This question belongs to: Maths Percentage

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