3.5% is the change from 858 to 888
Calculation steps:
[( 888 - 858 ) ÷ 858] x 100 = 3.5%
Formula
Percentage change = [(888 - 858) / 858] x 100
Subtract the new number by the original number
888 - 858 = 30
30 ÷ 858 = 0.03496503496503497
0.03496503496503497 x 100 = 3.5%