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The length of a rectangle is increased by 20% and its breadth by 10%. By what percent does its area increase?

Competition practiceMensuration

A30%
B32%
C34%
D22%

Step-by-Step Solution

Area factor

1.2 \times 1.1 = 1.32

, i.e. a 32% increase (or

20 + 10 + \frac{20 \times 10}{100} = 32

).

Answer: B) 32%

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