98.77% is the change from 81 to 161
Calculation steps:
[( 161 - 81 ) ÷ 81] x 100 = 98.77%
Formula
Percentage change = [(161 - 81) / 81] x 100
Subtract the new number by the original number
161 - 81 = 80
80 ÷ 81 = 0.9876543209876543
0.9876543209876543 x 100 = 98.77%