58.02% is the change from 81 to 128
Calculation steps:
[( 128 - 81 ) ÷ 81] x 100 = 58.02%
Formula
Percentage change = [(128 - 81) / 81] x 100
Subtract the new number by the original number
128 - 81 = 47
47 ÷ 81 = 0.5802469135802469
0.5802469135802469 x 100 = 58.02%