0.12% is the change from 830 to 831
Calculation steps:
[( 831 - 830 ) ÷ 830] x 100 = 0.12%
Formula
Percentage change = [(831 - 830) / 830] x 100
Subtract the new number by the original number
831 - 830 = 1
1 ÷ 830 = 0.0012048192771084338
0.0012048192771084338 x 100 = 0.12%