Computer price reduced 20%, sale increased 80%. Net effect on revenue: MCQ with Answer and Explanation

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Computer price reduced 20%, sale increased 80%. Net effect on revenue:

A. 44% increase

B. 56% increase

C. 36% increase

D. 24% increase

Answer: Option A

Solution (By JKSSB Mock Tests)

New revenue = 0.8×1.8 = 1.44, increase 44%.

This question belongs to: Maths Percentage

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Question #1

A number is decreased by 25% and then increased by 25%. The net change is:

A. 6.25% decrease

B. 5% decrease

C. No change

D. 6.25% increase

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Correct Answer: Option A

Explanation:
0.75 × 1.25 = 0.9375, decrease 6.25%.

This question belongs to: Maths Percentage

Question #2

Fresh grapes contain 68% water while dry grapes contain 20% water. How many kilograms of dry grapes can be obtained from 100 kg of fresh grapes?

A. 50 kg

B. 32 kg

C. 40 kg

D. 80 kg

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Correct Answer: Option C

Explanation:
Quantity of pulp in fresh grapes = 100% - 68% = 32%. So, pulp = 32 kg. In dry grapes, pulp is 100% - 20% = 80%. Let dry grapes be D kg. 80% of D = 32 implies D = (32 / 0.8) = 40 kg.

This question belongs to: Maths Percentage

Question #3

Price of TV increased 30% then decreased 30%. Net change:

A. No change

B. 6% decrease

C. 9% decrease

D. 9% increase

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Correct Answer: Option C

Explanation:
1.3 × 0.7 = 0.91, 9% decrease.

This question belongs to: Maths Percentage

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