C. 4%
Feedback Weight of A and B are 3x and 5x.
Initial weight before increase = (132*100)/110 = 120
8x = 120. X = 15
Initial weight of A and B are 45 and 75 kg respectively.
New weight of A = 54 so weight of B = 132 – 54 = 78.
So % increase = [(78-75)/75]*100 = 4 %