102.47% is the change from 81 to 164
Calculation steps:
[( 164 - 81 ) ÷ 81] x 100 = 102.47%
Formula
Percentage change = [(164 - 81) / 81] x 100
Subtract the new number by the original number
164 - 81 = 83
83 ÷ 81 = 1.0246913580246915
1.0246913580246915 x 100 = 102.47%