The population of a town increases by 10% annually. If the current population is 12,100, what was the population two years ago? MCQ with Answer and Explanation

Question

The population of a town increases by 10% annually. If the current population is 12,100, what was the population two years ago?

A. 9,000

B. 10,000

C. 12,000

D. 11,000

Answer: Option B

Solution (By JKSSB Mock Tests)

Let the population two years ago be P. P * (110 / 100) * (110 / 100) = 12100. P * 1.21 = 12100 implies P = 10000.

This question belongs to: Maths Percentage

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Question #1

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

A. 42%

B. 51%

C. 49%

D. 60%

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Correct Answer: Option B

Explanation:
New area = 0.7² = 0.49, decrease 51%.

This question belongs to: Maths Percentage

Question #2

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25% of 120 is:

A. 35

B. 25

C. 40

D. 30

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Correct Answer: Option D

Explanation:
0.25 × 120 = 30.

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Question #3

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6.25% expressed as a fraction is:

A. 1/16

B. 1/18

C. 1/20

D. 1/12

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Correct Answer: Option A

Explanation:
6.25/100 = 1/16.

This question belongs to: Maths Percentage

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