By how much should the area of rectangle be increased of its length (l) and breadth (b) are increased by 30 units and 40 units respectively.
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If length is increased by a % and breadth increased by b%
Then area increases by =(a+b+ab/100)%
=>(40+30+1200/100)%=70+12=82%
Then area increases by =(a+b+ab/100)%
=>(40+30+1200/100)%=70+12=82%
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