A number is decreased by 10% and then the new number is increased by 20%. If the resulting number is 540, find the original number. MCQ with Answer and Explanation

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A number is decreased by 10% and then the new number is increased by 20%. If the resulting number is 540, find the original number.

A. 480

B. 450

C. 500

D. 520

Answer: Option C

Solution (By JKSSB Mock Tests)

0.9 × 1.2 = 1.08, 1.08x = 540 → x = 500.

This question belongs to: Maths Percentage

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Practice More Percentage Questions

Question #1

20 is what percent of 80?

A. 25%

B. 20%

C. 35%

D. 30%

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Correct Answer: Option A

Explanation:
(20/80)×100 = 25%.

This question belongs to: Maths Percentage

Question #2

What percentage of 80 is 16?

A. 20%

B. 10%

C. 15%

D. 25%

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Correct Answer: Option A

Explanation:
(16 / 80) * 100 = 20%.

This question belongs to: Maths Percentage

Question #3

A man sells an article at 10% profit. Had he bought it at 20% less and sold it for Rs. 10 less, he would have gained 25%. Find the cost price.

A. Rs. 80

B. Rs. 110

C. Rs. 100

D. Rs. 90

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Correct Answer: Option C

Explanation:
CP=x, SP=1.1x. New CP=0.8x, new SP=1.1x-10. 1.1x-10 = 1.25×0.8x = x → 0.1x=10 → x=100.

This question belongs to: Maths Percentage

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