A number is erroneously multiplied by 4/3 instead of 3/4. Percentage error in calculation: MCQ with Answer and Explanation

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A number is erroneously multiplied by 4/3 instead of 3/4. Percentage error in calculation:

A. 80%

B. 66.67%

C. 75%

D. 77.78%

Answer: Option D

Solution (By JKSSB Mock Tests)

Correct = (3/4)x, wrong = (4/3)x. % error = [(4/3 - 3/4)/(3/4)]×100 = (7/9)×100 ≈ 77.78%.

This question belongs to: Maths Percentage

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Question #1

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The population of a town is 20,000. It increases by 5% annually. What will be the population after 2 years?

A. 22100

B. 21000

C. 22000

D. 22050

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Correct Answer: Option D

Explanation:
Population = 20000 * (1.05)^2 = 20000 * 1.1025 = 22050.

This question belongs to: Maths Percentage

Question #2

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A's income is 25% more than B's. B's expenditure is 40% less than A's. If A saves 20% of his income, what percent does B save?

A. 35%

B. 45%

C. 40%

D. 30%

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Correct Answer: Option C

Explanation:
Let B inc=100, A=125. A sav=25, A exp=100. B exp=0.6×100=60, B sav=100-60=40, i.e. 40%.

This question belongs to: Maths Percentage

Question #3

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3/8 expressed as percent is:

A. 30%

B. 35%

C. 33.5%

D. 37.5%

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Correct Answer: Option D

Explanation:
(3/8)×100 = 37.5%.

This question belongs to: Maths Percentage

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