A rectangle has length as \( 20 \mathrm { cm } \) and breadth as \( 12 \mathrm { cm } . \) If the length is increased by \( 5 \% \) and its breadth is decreased by \( 3 \% \), calculate increase or decrease of its area

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The length of a rectangle is

3

times its breadth, if the length is decreased by

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cm and the breadth increased by

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cm the area of the rectangle is increased by

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c m^{2}

The perimeter of the rectangle is

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