A number is increased by 50% and then decreased by 50%. The net change is: MCQ with Answer and Explanation

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A number is increased by 50% and then decreased by 50%. The net change is:

A. No change

B. 25% decrease

C. 25% increase

D. 50% decrease

Answer: Option B

Solution (By JKSSB Mock Tests)

1.5 × 0.5 = 0.75, 25% decrease.

This question belongs to: Maths Percentage

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Question #1

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The price of sugar is decreased by 20%. By what percent must a householder increase its consumption so that expenditure does not change?

A. 20%

B. 30%

C. 25%

D. 15%

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Correct Answer: Option C

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

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. 44.44%

B. 55.55%

C. 50%

D. 66.66%

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Correct Answer: Option B

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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Buy cycle for Rs. 1400, sell at 15% loss. Selling price:

A. 1210

B. 1190

C. 1150

D. 1160

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Correct Answer: Option B

Explanation:
1400 × 0.85 = 1190.

This question belongs to: Maths Percentage

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