The price of an article is increased by r% and then decreased by r%. If the net decrease is 1%, find r. MCQ with Answer and Explanation

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The price of an article is increased by r% and then decreased by r%. If the net decrease is 1%, find r.

A. 5

B. 8

C. 10

D. 12

Answer: Option C

Solution (By JKSSB Mock Tests)

1 - r²/10000 = 0.99 → r² = 100 → r = 10.

This question belongs to: Maths Percentage

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Question #1

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A train running at the speed of 72 kmph crosses a pole in 12 seconds. Find the length of the train.

A. 220 m

B. 200 m

C. 240 m

D. 260 m

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Correct Answer: Option C

Explanation:
Speed = 72 × 5/18 = 20 m/s. Length = 20×12 = 240 m.

This question belongs to: Maths Percentage

Question #2

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35% of a number is 105. 60% of that number is:

A. 170

B. 160

C. 190

D. 180

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Correct Answer: Option D

Explanation:
Number = 105/0.35 = 300, 60% of 300 = 180.

This question belongs to: Maths Percentage

Question #3

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The population of a town increases by 8% from 25,000. New population is:

A. 27,000

B. 28,000

C. 27,500

D. 26,500

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Correct Answer: Option A

Explanation:
25,000 × 1.08 = 27,000.

This question belongs to: Maths Percentage

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