Decrease 900 by 30%. Result is: MCQ with Answer and Explanation

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Decrease 900 by 30%. Result is:

A. 610

B. 620

C. 630

D. 600

Answer: Option C

Solution (By JKSSB Mock Tests)

900 × 0.7 = 630.

This question belongs to: Maths Percentage

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Question #1

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A number is increased by 10%, then increased by 25%, then decreased by 10%. Net percentage change:

A. 22.5% increase

B. 23.75% increase

C. 25% increase

D. 20% increase

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Correct Answer: Option B

Explanation:
1.1 × 1.25 × 0.9 = 1.2375, increase 23.75%.

This question belongs to: Maths Percentage

Question #2

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Price of a commodity falls by 20%. To keep expenditure constant, consumption must increase by:

A. 25%

B. 30%

C. 20%

D. 15%

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Correct Answer: Option A

Explanation:
New price 0.8, consumption multiplier needed = 1/0.8 = 1.25, increase 25%.

This question belongs to: Maths Percentage

Question #3

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A man saves 20% of his monthly income. If his monthly expenditure increases by 25% and his income increases by 30%, his savings increase by what percent?

A. 55%

B. 40%

C. 50%

D. 45%

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Correct Answer: Option C

Explanation:
Let income=100, exp=80, sav=20. New inc=130, new exp=80×1.25=100, sav=30. Increase = 10, % = (10/20)×100 = 50%.

This question belongs to: Maths Percentage

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