Salary increased by 20% then decreased by 20%. Net effect: MCQ with Answer and Explanation

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Salary increased by 20% then decreased by 20%. Net effect:

A. 2% decrease

B. 4% increase

C. 4% decrease

D. No change

Answer: Option C

Solution (By JKSSB Mock Tests)

1.2 × 0.8 = 0.96, 4% decrease.

This question belongs to: Maths Percentage

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Question #1

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A student multiplied a number by 3/4 instead of 4/3. What is the percentage error?

A. 50%

B. 40%

C. 45%

D. 43.75%

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Correct Answer: Option D

Explanation:
True = 4/3x. False = 3/4x. Error = (4/3 - 3/4)x = (7/12)x. % Error = ((7/12) / (4/3)) * 100 = (21/48) * 100 = 43.75%.

This question belongs to: Maths Percentage

Question #2

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Number increased 30% then decreased 25%. Net change:

A. 2.5% increase

B. 5% decrease

C. 2.5% decrease

D. 5% increase

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Correct Answer: Option C

Explanation:
1.3 × 0.75 = 0.975, 2.5% decrease.

This question belongs to: Maths Percentage

Question #3

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The price of a car depreciates at a rate of 15% per year. If its present value is Rs. 2,16,750, what was its value 2 years ago?

A. Rs. 3,00,000

B. Rs. 3,20,000

C. Rs. 2,80,000

D. Rs. 3,50,000

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Correct Answer: Option A

Explanation:
Value 2 yrs ago = 216750 / (0.85×0.85) = 216750/0.7225 = 300000.

This question belongs to: Maths Percentage

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