A student divided a number by 10 instead of multiplying it by 10. What is the percentage error? MCQ with Answer and Explanation

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

A. 95%

B. 90%

C. 100%

D. 99%

Answer: Option D

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Percentage

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Practice More Percentage Questions

Question #1

Cost of 20 items = SP of 15 items. Profit %:

A. 30%

B. 33.33%

C. 25%

D. 40%

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Correct Answer: Option B

Explanation:
Profit = (5/15)×100 = 33.33%.

This question belongs to: Maths Percentage

Question #2

Machine depreciates 15% per year. Present value Rs. 72,250, value 2 years ago was:

A. 1,00,000

B. 1,05,000

C. 95,000

D. 90,000

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Correct Answer: Option A

Explanation:
Value 2 years ago = 72250 / (0.85×0.85) = 72250 / 0.7225 = 1,00,000.

This question belongs to: Maths Percentage

Question #3

Two alloys have copper 70% and 40%. Mixed to get 55% copper. Ratio of mixing:

A. 1:2

B. 1:1

C. 2:1

D. 3:2

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Correct Answer: Option B

Explanation:
Alligation: (70-55):(55-40) = 15:15 = 1:1.

This question belongs to: Maths Percentage

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