A student multiplied a number by 3/5 instead of 5/3. What is the percentage error in the calculation? MCQ with Answer and Explanation

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A student multiplied a number by 3/5 instead of 5/3. What is the percentage error in the calculation?

A. 36%

B. 40%

C. 60%

D. 64%

Answer: Option D

Solution (By JKSSB Mock Tests)

True value = 5/3x. False value = 3/5x. Error = (5/3 - 3/5)x = (16/15)x. % Error = ((16/15) / (5/3)) * 100 = (16/25) * 100 = 64%.

This question belongs to: Maths Percentage

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Question #1

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Cost price Rs. 800, marked up 60%, then discount 30%. Profit percent:

A. 8%

B. 15%

C. 12%

D. 10%

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Correct Answer: Option C

Explanation:
MP = 800×1.6=1280, SP = 1280×0.7=896, profit 96, % = (96/800)×100 = 12%.

This question belongs to: Maths Percentage

Question #2

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A number is decreased by 25% and then increased by 25%. The net change is:

A. No change

B. 5% decrease

C. 6.25% decrease

D. 6.25% increase

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Correct Answer: Option C

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

This question belongs to: Maths Percentage

Question #3

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A man gave 20% of his money to his son, 30% of the remainder to his daughter, and 10% of what then remained to charity. He was left with Rs. 10080. Find the total money.

A. Rs. 20000

B. Rs. 18000

C. Rs. 16000

D. Rs. 22000

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Correct Answer: Option A

Explanation:
Let total = T. Son 20%, left 80%. Daughter 30% of 80% = 24% of T, left 56%. Charity 10% of 56% = 5.6% of T, left 50.4% = 10080 → T = 10080/0.504 = 20000.

This question belongs to: Maths Percentage

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