51.52% is the change from 66 to 100
Calculation steps:
[( 100 - 66 ) ÷ 66] x 100 = 51.52%
Formula
Percentage change = [(100 - 66) / 66] x 100
Subtract the new number by the original number
100 - 66 = 34
34 ÷ 66 = 0.5151515151515151
0.5151515151515151 x 100 = 51.52%