9.64% is the change from 83 to 91
Calculation steps:
[( 91 - 83 ) ÷ 83] x 100 = 9.64%
Formula
Percentage change = [(91 - 83) / 83] x 100
Subtract the new number by the original number
91 - 83 = 8
8 ÷ 83 = 0.0963855421686747
0.0963855421686747 x 100 = 9.64%