A number is increased by 10%, then increased by 20%, then decreased by 10%. Net percentage change: MCQ with Answer and Explanation

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A number is increased by 10%, then increased by 20%, then decreased by 10%. Net percentage change:

A. 12.8% increase

B. 16% increase

C. 18.8% increase

D. 20% increase

Answer: Option C

Solution (By JKSSB Mock Tests)

1.1 × 1.2 × 0.9 = 1.188, increase 18.8%.

This question belongs to: Maths Percentage

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Question #1

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A man's salary was reduced by 50% and then increased by 50%. Find the net change in his salary.

A. 15% decrease

B. 30% decrease

C. 40% decrease

D. 25% decrease

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Correct Answer: Option D

Explanation:
0.5 × 1.5 = 0.75, 25% decrease.

This question belongs to: Maths Percentage

Question #2

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A number is 20% less than another number. If the smaller number is 120, the larger number is:

A. 144

B. 160

C. 150

D. 140

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Correct Answer: Option C

Explanation:
Smaller = 80% of larger → 120 = 0.8L → L = 150.

This question belongs to: Maths Percentage

Question #3

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In an election, 10% of voters did not cast their votes. The winner obtained 60% of the cast votes and won by 720 votes. What was the total number of voters on the voting list?

A. 3600

B. 4400

C. 4000

D. 5000

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Correct Answer: Option C

Explanation:
Winner got 60%, Loser 40% of cast votes. Difference = 20% of cast votes = 720. Cast votes = 720 * 5 = 3600. Cast votes = 90% of total list. Total = 3600 / 0.9 = 4000.

This question belongs to: Maths Percentage

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