50.62% is the change from 81 to 122
Calculation steps:
[( 122 - 81 ) ÷ 81] x 100 = 50.62%
Formula
Percentage change = [(122 - 81) / 81] x 100
Subtract the new number by the original number
122 - 81 = 41
41 ÷ 81 = 0.5061728395061729
0.5061728395061729 x 100 = 50.62%