If the radius of a circle is decreased by 30%, the area decreases by: MCQ with Answer and Explanation

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If the radius of a circle is decreased by 30%, the area decreases by:

A. 51%

B. 42%

C. 49%

D. 60%

Answer: Option A

Solution (By JKSSB Mock Tests)

New area = 0.7² = 0.49, decrease 51%.

This question belongs to: Maths Percentage

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Practice More Percentage Questions

Question #1

If 15% of x is the same as 20% of y, then x:y is:

A. 3:4

B. 5:3

C. 4:3

D. 3:5

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Correct Answer: Option C

Explanation:
0.15x = 0.2y → x/y = 0.2/0.15 = 4/3 → 4:3.

This question belongs to: Maths Percentage

Question #2

Cost of 20 items = SP of 15 items. Profit %:

A. 30%

B. 33.33%

C. 40%

D. 25%

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Correct Answer: Option B

Explanation:
Profit = (5/15)×100 = 33.33%.

This question belongs to: Maths Percentage

Question #3

Allows 15% discount, still gains 19% profit. Markup % on CP:

A. 38%

B. 30%

C. 35%

D. 40%

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Correct Answer: Option D

Explanation:
CP=100, SP=119, MP=119/0.85=140, markup 40%.

This question belongs to: Maths Percentage

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