13.58% is the change from 81 to 92
Calculation steps:
[( 92 - 81 ) ÷ 81] x 100 = 13.58%
Formula
Percentage change = [(92 - 81) / 81] x 100
Subtract the new number by the original number
92 - 81 = 11
11 ÷ 81 = 0.13580246913580246
0.13580246913580246 x 100 = 13.58%