Two successive discounts of 10% and 20% on Rs. 1000 give final price: MCQ with Answer and Explanation

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Two successive discounts of 10% and 20% on Rs. 1000 give final price:

A. 720

B. 700

C. 750

D. 730

Answer: Option A

Solution (By JKSSB Mock Tests)

1000 × 0.9 × 0.8 = 720.

This question belongs to: Maths Percentage

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Question #1

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A number is decreased by 10% and then increased by 20%. The net change is:

A. 8% increase

B. 12% increase

C. 10% increase

D. 6% increase

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Correct Answer: Option A

Explanation:
0.9 × 1.2 = 1.08, 8% increase.

This question belongs to: Maths Percentage

Question #2

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A man saves 20% of his monthly income. If his monthly expenditure increases by 25% and his income increases by 30%, his savings increase by what percent?

A. 50%

B. 55%

C. 40%

D. 45%

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Correct Answer: Option A

Explanation:
Let income=100, exp=80, sav=20. New inc=130, new exp=80×1.25=100, sav=30. Increase = 10, % = (10/20)×100 = 50%.

This question belongs to: Maths Percentage

Question #3

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70% of a number is 28 less than 90%. Number is:

A. 130

B. 150

C. 140

D. 120

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Correct Answer: Option C

Explanation:
0.9x - 0.7x = 28 → 0.2x = 28 → x = 140.

This question belongs to: Maths Percentage

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