15.3% is the change from 830 to 957
Calculation steps:
[( 957 - 830 ) ÷ 830] x 100 = 15.3%
Formula
Percentage change = [(957 - 830) / 830] x 100
Subtract the new number by the original number
957 - 830 = 127
127 ÷ 830 = 0.1530120481927711
0.1530120481927711 x 100 = 15.3%