9.57% is the change from 857 to 939
Calculation steps:
[( 939 - 857 ) ÷ 857] x 100 = 9.57%
Formula
Percentage change = [(939 - 857) / 857] x 100
Subtract the new number by the original number
939 - 857 = 82
82 ÷ 857 = 0.09568261376896149
0.09568261376896149 x 100 = 9.57%