3.5% is the change from 857 to 887
Calculation steps:
[( 887 - 857 ) ÷ 857] x 100 = 3.5%
Formula
Percentage change = [(887 - 857) / 857] x 100
Subtract the new number by the original number
887 - 857 = 30
30 ÷ 857 = 0.03500583430571762
0.03500583430571762 x 100 = 3.5%