91.36% is the change from 81 to 155
Calculation steps:
[( 155 - 81 ) ÷ 81] x 100 = 91.36%
Formula
Percentage change = [(155 - 81) / 81] x 100
Subtract the new number by the original number
155 - 81 = 74
74 ÷ 81 = 0.9135802469135802
0.9135802469135802 x 100 = 91.36%