25.93% is the change from 81 to 102
Calculation steps:
[( 102 - 81 ) ÷ 81] x 100 = 25.93%
Formula
Percentage change = [(102 - 81) / 81] x 100
Subtract the new number by the original number
102 - 81 = 21
21 ÷ 81 = 0.25925925925925924
0.25925925925925924 x 100 = 25.93%