The price of an article increases by 10%, and then again by 10%. What is the net percentage increase? MCQ with Answer and Explanation

The price of an article increases by 10%, and then again by 10%. What is the net percentage increase?

A. 21%

B. 22%

C. 20%

D. 25%

Answer: Option A

Successive percentage formula: a + b + (ab / 100). 10 + 10 + (10 * 10 / 100) = 20 + 1 = 21%.

This question belongs to: Maths Percentage

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Question #1 Report Error

A town's population was 100,000 and is now 121,000. If the annual increase is 10%, in how many years did this increase occur?

A. 3

B. 1

C. 4

D. 2

Correct Answer: Option D

Explanation:
121000 = 100000 * (1.10)^t. 1.21 = (1.10)^t. Since 1.10^2 = 1.21, t = 2 years.

This question belongs to: Maths Percentage

Question #2 Report Error

Radius of a circle increased by 100%. Percentage increase in area:

A. 400%

B. 100%

C. 200%

D. 300%

Correct Answer: Option D

Explanation:
Area proportional to radius². New radius 2r, area 4 times, increase = 300%.

This question belongs to: Maths Percentage

Question #3 Report Error

Fresh fruit has 68% water, dry fruit 20% water. Dry fruit from 100 kg fresh fruit:

A. 40 kg

B. 60 kg

C. 32 kg

D. 50 kg

Correct Answer: Option A

Explanation:
Dry matter in fresh = 32 kg, in dry fruit 80% is dry matter, weight = 32/0.8 = 40 kg.

This question belongs to: Maths Percentage