A student multiplied a number by 7/4 instead of 4/7. What is the percentage error? MCQ with Answer and Explanation

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A student multiplied a number by 7/4 instead of 4/7. What is the percentage error?

A. 200%

B. 100%

C. 150%

D. 206.25%

Answer: Option D

Solution (By JKSSB Mock Tests)

True = 4/7x. False = 7/4x. Error = (7/4 - 4/7)x = (33/28)x. % Error = ((33/28) / (4/7)) * 100 = (33/16) * 100 = 206.25%.

This question belongs to: Maths Percentage

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Practice More Percentage Questions

Question #1

Price of TV increased 25% then decreased 25%. Net change:

A. No change

B. 6.25% decrease

C. 5% decrease

D. 6.25% increase

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Correct Answer: Option B

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

This question belongs to: Maths Percentage

Question #2

A's salary 15% less than B's. By what % must A's salary be raised to equal B's?

A. 15%

B. 18%

C. 16.67%

D. 17.65%

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Correct Answer: Option D

Explanation:
A=85, B=100. Increase needed = (15/85)×100 ≈ 17.65%.

This question belongs to: Maths Percentage

Question #3

In an election, 20% of the votes were declared invalid. The winner got 70% of the valid votes and won by 1600 votes. Find the total number of votes polled.

A. 6000

B. 4000

C. 8000

D. 5000

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Correct Answer: Option D

Explanation:
Winner got 70%, Loser 30% of valid votes. Difference = 40% of valid votes = 1600. Valid votes = 4000. Valid votes = 80% of total. Total = 4000 / 0.8 = 5000.

This question belongs to: Maths Percentage

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