By what amount area of a rectangle is to be increased, if it's length and breadth are increased by 30 units and 40 units respectively.
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We have length = 30 unit
Breadth B = 40 unit
Area of rectangle = length \times breadthlength×breadth
= 30 \times 4030×40
= 1200 sq unit.
Hence the area of rectangle is to be increased by amont of 1200 sq unit.
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