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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A gets 20% more than B, B gets 25% more than C. C=400, A's share:

A. 500

B. 650

C. 600

D. 550

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Correct Answer: Option C

Explanation:
C=400, B=400×1.25=500, A=500×1.2=600.

This question belongs to: Maths Percentage

Question #2

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Cost article Rs. 200, marked up 40%, then 20% discount. Selling price:

A. 240

B. 280

C. 260

D. 224

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Correct Answer: Option D

Explanation:
Marked = 200×1.4 = 280, SP = 280×0.8 = 224.

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Question #3

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A number is increased by 15% and then decreased by 15%. If the resulting number is 782, what was the original number?

A. 750

B. 780

C. 820

D. 800

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Correct Answer: Option D

Explanation:
1.15 × 0.85 = 0.9775. 0.9775x = 782 → x = 782/0.9775 = 800.

This question belongs to: Maths Percentage

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