Radius of circle decreased 10%. Area decreases by: MCQ with Answer and Explanation

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Radius of circle decreased 10%. Area decreases by:

A. 19%

B. 21%

C. 20%

D. 17%

Answer: Option A

Solution (By JKSSB Mock Tests)

Area multiplier = 0.9² = 0.81, decrease 19%.

This question belongs to: Maths Percentage

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Practice More Percentage Questions

Question #1

Buy article for Rs. 1800, sell at 12% loss. Selling price:

A. 1584

B. 1600

C. 1566

D. 1544

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Correct Answer: Option A

Explanation:
1800 × 0.88 = 1584.

This question belongs to: Maths Percentage

Question #2

The value of a machine depreciates at 20% per annum. Its present value is Rs. 51200. What was its value 2 years ago?

A. Rs. 80000

B. Rs. 75000

C. Rs. 85000

D. Rs. 72000

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Correct Answer: Option A

Explanation:
Value 2 yrs ago = 51200 / (0.8×0.8) = 51200/0.64 = 80000.

This question belongs to: Maths Percentage

Question #3

What percent is 400 g of 4 kg?

A. 12.5%

B. 8%

C. 10%

D. 12%

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Correct Answer: Option C

Explanation:
4 kg = 4000 g, (400/4000)×100 = 10%.

This question belongs to: Maths Percentage

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