The population of a town is 20,000. It increases by 5% annually. What will be the population after 2 years? MCQ with Answer and Explanation

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The population of a town is 20,000. It increases by 5% annually. What will be the population after 2 years?

A. 22050

B. 22000

C. 21000

D. 22100

Answer: Option A

Solution (By JKSSB Mock Tests)

Population = 20000 * (1.05)^2 = 20000 * 1.1025 = 22050.

This question belongs to: Maths Percentage

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Question #1

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Population 2,00,000. First year +8%, second year -5%. Population after 2 years:

A. 2,08,800

B. 2,05,200

C. 2,07,600

D. 2,06,400

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Correct Answer: Option B

Explanation:
2,00,000 × 1.08 × 0.95 = 2,05,200.

This question belongs to: Maths Percentage

Question #2

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A student multiplied a number by 2/3 instead of 3/2. What is the percentage error?

A. 66.66%

B. 50%

C. 55.55%

D. 44.44%

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Correct Answer: Option C

Explanation:
True = 3/2x. False = 2/3x. Error = (3/2 - 2/3)x = (5/6)x. % Error = ((5/6) / (3/2)) * 100 = (10/18) * 100 = 55.55%.

This question belongs to: Maths Percentage

Question #3

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Two numbers are 20% and 50% more than a third number. Their ratio is:

A. 4:5

B. 5:6

C. 5:4

D. 6:7

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Correct Answer: Option A

Explanation:
Third = 100, first = 120, second = 150, ratio = 120:150 = 4:5.

This question belongs to: Maths Percentage

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