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(D) Let the original length be $L$ and the original breadth be $B$. The original perimeter is $P_1 = 2(L + B)$.After the changes,the new length $L' =

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$	ext{Cannot be determined}$

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(D) Let the original length be $L$ and the original breadth be $B$. The original perimeter is $P_1 = 2(L + B)$.After the changes,the new length $L' = 1.2L$ and the new breadth $B' = 0.9B$.The new perimeter is $P_2 = 2(1.2L + 0.9B) = 2.4L + 1.8B$.The change in perimeter is $\Delta P = P_2 - P_1 = (2.4L + 1.8B) - (2L + 2B) = 0.4L - 0.2B$.The percentage change in perimeter is $\frac{0.4L - 0.2B}{2(L + B)} 	imes 100 = \frac{0.2L - 0.1B}{L + B} 	imes 100$.Since the result depends on the ratio of $L$ to $B$,the percentage change cannot be determined without knowing the initial dimensions of the rectangle.

If the length of a rectangle is increased by $20 \%$ and its breadth is decreased by $10 \%$,what will be the impact on its perimeter?

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