50.91% is the change from 55 to 83
Calculation steps:
[( 83 - 55 ) ÷ 55] x 100 = 50.91%
Formula
Percentage change = [(83 - 55) / 55] x 100
Subtract the new number by the original number
83 - 55 = 28
28 ÷ 55 = 0.509090909090909
0.509090909090909 x 100 = 50.91%