1.  The percentage increase in the area of a rectangle, if each of its sides is increased by 20% is: 

Answer: Option C Explanation: Let original length = x metres and original breadth = y metres. Original area = (xy) m^{2}.
The difference between the original area = xy and newarea 36/25 xy is = (36/25)xy  xy = xy(36/25  1) = xy(11/25) or (11/25)xy
