3.25% is the change from 830 to 857
Calculation steps:
[( 857 - 830 ) ÷ 830] x 100 = 3.25%
Formula
Percentage change = [(857 - 830) / 830] x 100
Subtract the new number by the original number
857 - 830 = 27
27 ÷ 830 = 0.03253012048192771
0.03253012048192771 x 100 = 3.25%