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

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

A. 400%

B. 200%

C. 100%

D. 300%

Answer: Option D

Solution (By JKSSB Mock Tests)

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

55% of a number is 33 less than 70% of the same number. The number is:

A. 240

B. 200

C. 220

D. 180

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Correct Answer: Option C

Explanation:
0.7x - 0.55x = 33 → 0.15x = 33 → x = 220.

This question belongs to: Maths Percentage

Question #2

The price of a shirt decreases from Rs. 80 to Rs. 60. What is the percentage decrease in the price?

A. 20%

B. 30%

C. 33.33%

D. 25%

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Correct Answer: Option D

Explanation:
Decrease = 80 - 60 = 20. Percentage decrease = (20 / 80) * 100% = 25%.

This question belongs to: Maths Percentage

Question #3

In an election between two candidates, the winning candidate got 60% of the valid votes and won by a majority of 2,400 votes. What was the total number of valid votes?

A. 12,000

B. 10,000

C. 15,000

D. 14,000

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Correct Answer: Option A

Explanation:
Winner got 60%, loser got 40%. Difference = 20%. 20% of total votes = 2400. Total votes = (2400 * 100) / 20 = 12000.

This question belongs to: Maths Percentage

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