A number is erroneously multiplied by 5/3 instead of 3/5. Percentage error in calculation: MCQ with Answer and Explanation

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A number is erroneously multiplied by 5/3 instead of 3/5. Percentage error in calculation:

A. 166.67%

B. 180%

C. 150%

D. 177.78%

Answer: Option D

Solution (By JKSSB Mock Tests)

Correct = (3/5)x, wrong = (5/3)x. % error = [(5/3 - 3/5)/(3/5)]×100 = (16/9)×100 ≈ 177.78%.

This question belongs to: Maths Percentage

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Practice More Percentage Questions

Question #1

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A student divided a number by 10 instead of multiplying it by 10. What is the percentage error?

A. 90%

B. 100%

C. 99%

D. 95%

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Correct Answer: Option C

Explanation:
True = 10x. False = 0.1x. Error = 9.9x. % Error = (9.9 / 10) * 100 = 99%.

This question belongs to: Maths Percentage

Question #2

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A man spends 25% on rent, 20% of remainder on food, 15% of remainder on education, saves Rs. 15300. Income:

A. 28000

B. 30000

C. 25000

D. 32000

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Correct Answer: Option B

Explanation:
Rent 0.25I, left 0.75I. Food 0.15I, left 0.6I. Education 0.09I, left 0.51I = 15300 → I=30000.

This question belongs to: Maths Percentage

Question #3

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A shopkeeper marks his goods 25% above cost price and allows a discount of 10%. His gain percent is:

A. 15%

B. 12.5%

C. 17.5%

D. 10.5%

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Correct Answer: Option B

Explanation:
CP=100, MP=125, SP=112.5, gain 12.5%.

This question belongs to: Maths Percentage

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