The price of an article is increased by r% and then decreased by r%. If the net decrease is 1%, find r. MCQ with Answer and Explanation

The price of an article is increased by r% and then decreased by r%. If the net decrease is 1%, find r.

A. 8

B. 12

C. 5

D. 10

Answer: Option D

1 - r²/10000 = 0.99 → r² = 100 → r = 10.

This question belongs to: Maths Percentage

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Question #1 Report Error

Income of A is 20% more than B. B's expenditure is 30% less than A's. A saves 10% of his income. B saves what % of his income?

A. 24.4%

B. 26.4%

C. 28.4%

D. 22.4%

Correct Answer: Option A

Explanation:
Let B inc = 100, A inc = 120. A sav = 12, A exp = 108. B exp = 70% of 108 = 75.6. B sav = 100-75.6 = 24.4, i.e. 24.4%.

This question belongs to: Maths Percentage

Question #2 Report Error

Price of pen up 12%. By what % reduce consumption so that expenditure rises only 4%?

A. 7.14%

B. 8%

C. 6.67%

D. 8.33%

Correct Answer: Option A

Explanation:
1.12 × x = 1.04 → x = 1.04/1.12 = 0.92857, reduction = 7.14%.

This question belongs to: Maths Percentage

Question #3 Report Error

What percent of 80 is 20?

A. 30%

B. 15%

C. 25%

D. 20%

Correct Answer: Option C

Explanation:
(20/80) × 100 = 25%.

This question belongs to: Maths Percentage