9.88% is the change from 81 to 89
Calculation steps:
[( 89 - 81 ) ÷ 81] x 100 = 9.88%
Formula
Percentage change = [(89 - 81) / 81] x 100
Subtract the new number by the original number
89 - 81 = 8
8 ÷ 81 = 0.09876543209876543
0.09876543209876543 x 100 = 9.88%