The length and breadth of a square are increased by 40% and 30% respectively. The area of the rectangle so formed exceeds the area of the square by ? Choose the correct choice:
A) 82%  B) 78%  C) 80%  D) 90%  E) none of these
Since Side1 x Side2 = Area   Therefore, net% change in area   = ( x + y + xy/100) %   = [40 + 30 + (40 x 30)/100]% or 82%.   Therefore, area is increased by 82%.   82%NSWER:82%
<result>A</result>
The length and breadth of a square are increased by 40% and 30% respectively. The area of the rectangle so formed exceeds the area of the square by ?