13.13% is the change from 830 to 939
Calculation steps:
[( 939 - 830 ) ÷ 830] x 100 = 13.13%
Formula
Percentage change = [(939 - 830) / 830] x 100
Subtract the new number by the original number
939 - 830 = 109
109 ÷ 830 = 0.13132530120481928
0.13132530120481928 x 100 = 13.13%