30.91% is the change from 55 to 72
Calculation steps:
[( 72 - 55 ) ÷ 55] x 100 = 30.91%
Formula
Percentage change = [(72 - 55) / 55] x 100
Subtract the new number by the original number
72 - 55 = 17
17 ÷ 55 = 0.3090909090909091
0.3090909090909091 x 100 = 30.91%